Decide on Office 365 Migration Path

Deciding on the best migration path of your users’ email to Office 365 can be difficult. Your migration performance will vary based on your network, existing messaging systems design, mailbox size, migration speed, and so on.

For migrations from an existing on-premises Exchange Server environment, you can migrate all email, calendar items, tasks and contacts from user mailboxes to Office 365. The available methods are cutover, staged, and Exchange Hybrid migrations.

For migrating third-party email to Office 365, you can configure mail flow coexistence if the third-party email provider permits then migrate the mailboxes using IMAP or cutover migration options.

Migrating from Exchange 2003 or Exchange 2007

Number of mailboxes	How quickly do you want to migrate?	Use
Fewer than 150	Over a weekend or a few days.	Cutover
Fewer than 150	Slowly, by migrating a few users at a time.	Staged
Over 150	Over a weekend or a few days.	Staged
Over 150	Slowly, by migrating a few users at a time.	Staged

Migrating from Exchange 2010 or Exchange 2013 or Exchange 2016 or Exchange 2019

Number of mailboxes	How quickly do you want to migrate?	Use
Fewer than 150	Over a weekend or a few days.	Cutover
Fewer than 150	Slowly, by migrating a few users at a time.	Exchange Hybrid
Over 150	Over a weekend or a few days.	Exchange Hybrid
Over 150	Slowly, by migrating a few users at a time.	Exchange Hybrid

Migrating from third-party email system to Office 365

Number of mailboxes	How quickly do you want to migrate?	Use
Fewer than 150	Over a weekend or a few days.	Cutover
more than 150	Slowly, by migrating a few users at a time.	IMAP with mail flow coexistence

If the mailboxes you’re migrating contain a large amount of data, you can also use Office 365 Import Service to import PST files to Office 365.

Azure AD B2B Collaboration With SharePoint Online

Azure AD B2B collaboration capabilities to invite guest users into your Azure AD tenant to allow them to access Azure AD service Azure AD B2B collaboration invited users can be picked from OneDrive/SharePoint Online sharing dialog boxes. OneDrive/SharePoint Online invited users also show up in Azure AD after they redeem their invitations and other resources such OneDrive for Business, SharePoint Online in your organization.

Azure AD B2B Collaboration (Source Microsoft Corp)

Licensing Requirements for Paid Features:

The customer who owns the inviting tenant must be the one to determine how many B2B collaboration users need paid Azure AD capabilities. Depending on the paid Azure AD features you want for your guest users, you must have enough Azure AD paid licenses to cover B2B collaboration users in the same 5:1 ratio.

Contoso Corp B2B Collaboration with partners (Source Microsoft Corp)

The below guides articulate how to deploy Azure B2B functionality for SharePoint Online.

Turning on Azure AD Integrated App for Office 365

1. Log on to Office 365 portal.office.com using your work or school account.
2. Go to the Office 365 admin center, and from the left navigation bar, click Settings> Services & add-ins
3. On the Integrated apps page, use the toggle to turn Integrated Apps on or off.

Add a B2B User

1. Sign in to the Azure portal as an Azure AD administrator.
2. In the navigation pane, select Azure Active Directory.
3. Under Manage, select Users. Select New guest user.
4. Under User name, enter the email address of the external user. Optionally, include a welcome message.
5. Select Invite to automatically send the invitation to the guest user.
6. To assign Group Permission, Under Manage, select Groups.
7. Select a group (or click New group to create a new one). It’s a good idea to include in the group description that the group contains B2B guest users.
8. Select Members. Add the Guest User.

Add Azure AD B2B Licenses

1. Log on to Azure Portal.Azure.com, Navigate to Azure Active Directory
2. To assign a license, under Azure Active Directory > Licenses > All Products, select one or more products, and then select Assign on the command bar.
3. You can use the Users and groups blade to choose multiple users or groups or to disable service plans in the product. Use the search box on top to search for user and group names.
4. When you assign licenses to a group, it can take some time before all users inherit the license depending on the size of the group. You can check the processing status on the Group blade, under the Licenses

Add guest users to a SharePoint Online App

1. Sign in to the Azure portal as an Azure AD administrator. In the navigation pane, select Azure Active Directory.
2. Under Manage, select Enterprise applications > All applications. Select the application to which you want to add guest users.
3. On the application’s dashboard, select Total Users to open the Users and groups pane.
4. Select Add user. Under Add Assignment, select User and groups.
5. If the guest user already exists in the directory, search for the B2B user. Select the user, click Select, and then click Assign to add the user to the app.
6. The guest user appears in the application’s Users and groups list with the assigned role of Default Access or Under Edit Assignment, click Select Role, and select the role you want to assign to the selected user. Click Select. Click Assign.

Turn on External Sharing for SharePoint Online

1. Sign in to Office 365 as a global admin or SharePoint admin.
2. Select the app launcher icon The app launcher icon in Office 365 in the upper-left and choose Admin to open the Office 365 admin center. (If you don’t see the Admin tile, you don’t have Office 365 administrator permissions in your organization.)
3. In the left pane, choose Admin centers > SharePoint.
4. In the left pane, click sharing.
5. Select “Allow sharing only with the external users that already exist in your organization’s directory.”
6. You can setup additional settings such as Limits external sharing using domains, prevent external users from sharing files, External User must accept sharing invitations.

Turn on External Sharing for Specific Site Collection

1. Sign in to Office 365 as a global admin or SharePoint admin.
2. Select the app launcher icon The app launcher icon in Office 365 in the upper-left and choose Admin to open the Office 365 admin center. (If you don’t see the Admin tile, you don’t have Office 365 administrator permissions in your organization.)
3. In the left pane, choose Admin centers > SharePoint.
4. Click Try the preview to open the new SharePoint admin center.
5. In the left pane, click Site management.
6. Locate the site that you want to update, and click the site name.
7. In the right pane, under Sharing status, click Change.
8. Select your option (see the following table) and click Save.

Redemption through the invitation email

If invited through a method that sends an invitation email, users can also redeem an invitation through the invitation email. An invited user can click the redemption URL in the email, and then review and accept the privacy terms.

1. After being invited, the invitee receives an invitation through email that’s sent from Microsoft Invitations.
2. The invitee selects Get Started in the email.
3. If the invitee doesn’t have an Azure AD account or an MSA, they’re prompted to create an MSA.
4. The invitee is redirected to the Review permissions screen, where they can review the inviting organization’s privacy statement and accept the terms.

Office 365 MailFlow Scenarios and Best Practices

Microsoft Office 365 gives you the flexibility to configure mail flow based on your requirements and uses scenario to delivered email to your organisation’s mailboxes. The simplest way to configure mail flow is to allow Microsoft EOP to handle spam filter and Maiflow of your organisation. However, you may have already invested your infrastructure handle mail flow. Microsoft also accepts this situation and allow you to use your own spam filter.

The below scenario and use cases will allow you to determine how you can configure MailFlow of your organisation.

Mailbox Location	MailFlow Entry Point	Scenario & Usecases	Recommended MailFlow Configuration  and Example MX record
Office 365	Office 365	Use Microsoft EOP Demote or migrate all mailboxes to office 365 Use Office 365 mailboxes	MX record Pointed to Office 365 MX: domain-com.mail.protection.outlook.com SPF:  v=spf1 include:spf.protection.outlook.com -all
On-premises	On-prem	Prepare the on-prem to be cloud ready Build and Sync AAD Connect Built ADFS Farm	MX record Pointed to On-prem MX1.domain.com SPF: v=spf1 include: MX1.domain.com  include:spf.protection.outlook.com -all
Third-party cloud, for example, G-Suite	Both third-party and office 365	Prepare to migrate to Office 365 Stage mailbox data MailFlow co-existance	MX record pointed to third-party cloud MX record Pointed to On-prem in.hes.trendmicro.com SPF: v=spf1 include:spf.protection.outlook.com include: in.hes.trendmicro.com include: ASPMX.L.GOOGLE.COM -all
Combination of On-premises and Office 365	On-premises	Hybrid Environment Stage mailbox migration MailFlow co-existance	MX record Pointed to On-prem spam filter MX record Pointed to On-prem MX1.domain.com SPF: v=spf1 include: MX1.domain.com  include:spf.protection.outlook.com -all
Combination of On-premises and Office 365	Third-party cloud spam filter	Hybrid Environment Stage mailbox migration MailFlow co-existance	MX record Pointed to third-party cloud spam filter MX record pointed to third-party cloud MX record Pointed to On-prem in.hes.trendmicro.com SPF: v=spf1 include:spf.protection.outlook.com include: in.hes.trendmicro.com -all

MailFlow Configuration Prerequisites:

1. Make sure that your email server (also called “on-premises mail server”) is set up and capable of sending and receiving mail to and from the Internet.
2. Check that your on-premises email server has Transport Layer Security (TLS) enabled, with a valid public certification authority-signed (CA-signed) certificate.
3. Make a note of the name or IP address of your external-facing email server. If you’re using Exchange, this will be the Fully Qualified Domain Name (FQDN) of your Edge Transport server or CAS that will receive an email from Office 365.
4. Open port 25 on your firewall so that Office 365 can connect to your email servers.
5. Make sure your firewall accepts connections from all Office 365 IP addresses. See Exchange Online Protection IP addresses for the published IP address range.
6. Make a note of an email address for each domain in your organisation. You’ll need this later to test that your connector is working correctly.
7. Make sure you add all datacenter IP addresses of Office 365 into your receive connector of on-premises Exchange server

Configure mail to flow from Office 365 to your email server and vice-versa. There are three steps for this:

1. Configure your Office 365 environment.
2. Set up a connector from Office 365 to your email server.
3. Change your MX record to redirect your mail flow from the Internet to Office 365.

Note: For Exchange Hybrid Configuration wizard, connectors that deliver mail between Office 365 and Exchange Server will be set up already and listed here. You don’t need to set them up again, but you can edit them here if you need to.

1. To create a connectorExchange in Office 365, click Admin, and then click to go to the Exchange admin center. Next, click mail flow click mail flow, and click connectors.
2. To start the wizard, click the plus symbol +. On the first screen, choose the appropriate options when creating MailFlow from Office 365 to On-premises Server
3. Click Next, and follow the instructions in the wizard.
4. Repeat the step to create MailFlow between On-premises to Office 365.
5. To redirect email flow to Office 365, change the MX (mail exchange) record for your domain to Microsoft EOP, i.e. domain-com.mail.protection.outlook.com

Relevant Articles:

Mailflow Co-existence between G-Suite and Office 365 during IMAP Migration

Office 365 Hybrid Deployment with Exchange 2016 Step by Step

Centralized MailFlow: NDR Remote Server returned ‘550 5.7.1 Unable to relay’

Migrate Office 365 Relying Party Trust to Different ADFS Farm

To migrate Office 365 Relying Party Trust from an existing ADFS Farm to new ADFS Farm, follow the step by step guide. Migrating Office 365 Relying Party Trust will incur a minor disruption to SSO environment.

Prerequisites:

• Existing ADFS Farm with FQDN sts.domain.com
• New ADFS Farm with FQDN sts1.domain.com
• Existing Certificate CN=sts.domain.com or a wildcard certificate
• New certificate with CN=sts1.domain.com
• New public IP address for the public CNAME sts1.domain.com
• A public CNAME record sts1.domain.com
• An internal CNAME record sts1.domain.com

Note: keep the existing AAD Connect unless you have a requirement to build a new one.

Here are the steps:

Step1: Verify AAD Connect Configuration

• Open AAD Connect, View Sign-in Option.
• Check AAD Connect Wizard to make sure you did not configure “Federation with ADFS” Sign-in option. If you have done so then run AAD Connect Wizard again and replace the certificate and ADFS farm details to new ADFS server sts1.domain.com

Step2: Build ADFS and WAP Servers

Build a new ADFS farm side by side with an existing ADFS farm. It would be redundant effort to write another blog. Please follow my previous blog to deploy ADFS and WAP.

Building Multiple ADFS Farms in a Single Forest

Deploy Web Application Proxy Role in Windows Server 2012 R2 –Part I

Branding and Customizing the ADFS Sign-in Pages

Step3: Test SSO

Log on to the https://sts.domain.com/adfs/ls/idpinitiatedsignon.aspx using on-premises credentials to make sure you can single sign-on.

Step4: Gather list of existing federated domains from existing ADFS Farm

Log on to the existing primary ADFS Server, Open PowerShell as an Administrator, execute the following cmdlets.

$cred=Get-Credential

Connect-MsolService –Credential $cred

Get-MsolDomain

Record a list of Federated Domains.

Step5: Update Office 365 RP within the new ADFS Farm

Log on to the new primary ADFS Server, Open PowerShell as an Administrator, execute the following cmdlets.

$cred=Get-Credential

Connect-MsolService –Credential $cred

Update-MsolFederatedDomain –DomaiName “Domain.com” –SupportMultipleDomain –Confirm  Execute Update-MsolFederatedDomain Cmdlets if you have additional federated domains such as DomainB.com

Get–MsolDomain

Open ADFS Management Console, Make sure Office 365 RP has been created with necessary tokens and permissions. If necessary, clone all incoming and outgoing claims and permission from previous ADFS farm to new ADFS Farm and apply to the newly created Office 365 RP.

Step6: Test SSOOnce you have completed the Step5, wait for Microsoft to update their backend Identity and Federation systems. In my previous implementation work, it took 30 minutes the change to take effect.  Sign on to portal.office.com; you will be redirected to https://sts1.domain.com to authenticate. Once you have sign-in successfully, you have completed the migration work.

Step7: New AAD Connect Server (Optional)Check step1 before running AAD Connect Wizard and reconfigure sign-in options. If you need to change sign-in options, please follow the guide to change Sign-in Option.

Relevant Articles:

Upgrading AD FS to Windows Server 2016 FBL

Deploy Web Application Proxy Role in Windows Server 2012 R2 –Part II

Office 365 Hybrid Deployment with Multiple Active Directory Forests

This article explains how you can deploy a hybrid Office 365 and Exchange on-premises environment with multiple Active Directory Forest. An organisation that utilizes an account forest and a resource forest to separate Active Directory accounts and Exchange servers in a single forest, aren’t considered as multiple AD Forest. Let’s say Company A (DomainA.com) bought Company B (DomainB.com). Company A has an Office 365 tenant with default domain domainA.onmicrosoft.com. Now Company A wishes to migrate Company B mailboxes into the Office 365 tenant but maintains the hybrid environment.

Here is the infrastructure you should consider.

	AD Forest 1	AD Forest 2
On-prem Forest	Corp.DomainA.com	Corp.DomainB.com
Email Domain or Externally Routable NameSpace	DomainA.com	DomainB.com
Externally Routable Autodiscover CNAME	Autodiscover.DomainA.com	Autodiscover.DomainB.com
Default Domain in Office 365 Tenant	domainA.onmicrosoft.com	domainA.onmicrosoft.com
On-Prem Exchange Server Version	Exchange 2013 SP1 or later	Exchange 2013 SP1 or later
On-prem Certificate	Issued by Public CA CN= mail.DomainA.com SAN=Autodiscover.DomainA.com	Issued by Public CA CN= mail.DomainB.com SAN=Autodiscover.DomainB.com

To configure a hybrid environment for a multi-forest organization, you’ll need to complete the basic steps below:

1. Create Two-Way Trust Relationship between on-premises Corp.DomainA.com and On-premises Corp.DomainB.com if Trust relationship is not already established.
2. Make sure you have correct public certificates for both Exchange Organisation.
3. Build AAD Connect Server in Corp.DomainA.com Domain. AD Synchronisation occurs Corp.DomainA.com domain. you do not need to add another AAD Connect server in domainB.com domain. Run custom AAD Connect wizard and use domain filter and select both domains to sync to Azure AD.
4. Build ADFS Farm in Corp.DomainA.com Domain. You use either AD FS or password sync to allow for a seamless user authentication experience for both domains.
5. Add domain and verify both domains in Office 365 tenant. Setup both domain in Office tenant as an Internal Relay Domain
6. Run Hybrid Configuration wizard in both Forest. Select both domains whilst running HCW.  For Centralized MailFlow Configuration of both domains, you must retain your existing MX record. Add EOP in your SPF record for the both domains. If you do not wish to configure Centralized MailFlow then point MX record to the EOP record of Exchange Online.

AAD Connect Recommendations:

• Separate Topology – This topology might be the situation after a merger/acquisition or in an organization where each business unit operates independently. These forests are in the same organization in Azure AD and appear with a unified GAL.

In AAD Connect Wizard Select “Users are only once across all forests” and Mail Attribute.

• Full Mesh- A full mesh topology allows users and resources to be located in any forest. Commonly, there are two-way trusts between the forests.

In AAD Connect Wizard Select “Users identities exist across multiple forests” and Mail Attribute.

Hybrid with Multiple Forest  Recomendations:

• Having a single tenant in Azure AD for an organization
• Having a single ADD connect server for an organisation
• Having a unique Active Directory object for an organisation. Each unique object is synced into the Azure AD for once only.
• Having a single on-prem namespace (UPN: domainA.com, domainB.com) to match the registered domain in Azure AD.
• Having a single namespace associated with an user or an object
• Having all email domains registered in a single tenant
• Having a single AAD Connect and ADFS Farm in a same forest if “Federation with ADFS” is selected in AAD Connect custom installation Wizard

Relevant Article:

Office 365 Hybrid Deployment with Exchange 2016 Step by Step

Configuring Azure ExpressRoute using PowerShell

Microsoft Azure ExpressRoute is a private connection from on-premises networks to the Microsoft cloud over a private peering facilitated by a network service provider. With ExpressRoute, you can establish a faster, low latencies and reliable connection to Microsoft cloud services, such as Microsoft Azure, Office 365, and Dynamics 365. ExpressRoute is available to all continent and in all geopolitical boundaries.

ExpressRoute Circuit Connectivity Model

• Co-located at a cloud exchange- The on-premises infrastructure is co-located in a facility with Microsoft Azure Cloud, you can order virtual cross-connections to the Microsoft cloud through the co-location provider’s Ethernet exchange. Data center providers can offer either Layer 2 cross-connections, or managed Layer 3 cross-connections between your infrastructure in the colocation facility and the Microsoft cloud.
• Point-to-point Ethernet connections- You can connect your on-premises infrastructure to the Microsoft cloud through point-to-point Ethernet links. Point-to-point Ethernet providers can offer Layer 2 connections, or managed Layer 3 connections between your site and the Microsoft cloud.
• Any-to-any (IPVPN) networks- You can integrate company WAN with the Microsoft cloud. IPVPN providers are typically MPLS connection between your branch offices and data centers. The Microsoft cloud can be interconnected to company WAN to make it look just like another branch office.

Key Features:

• Layer 3 connectivity between your on-premises network and the Microsoft Cloud through a connectivity provider.
• Connectivity to Microsoft cloud services across all regions in the geopolitical region.
• Global connectivity to Microsoft services across all regions with an ExpressRoute premium add-on.
• Dynamic routing between your network and Microsoft over industry standard protocols (BGP).
• Built-in redundancy in every peering location for higher reliability.
• QoS support for Skype for Business.
• Bandwidth starting from 50Mbps to 10Gbps

Subscription requirements:

• A valid and active Microsoft Azure account or an active Office 365 subscription. This account is required to set up the ExpressRoute circuit. ExpressRoute circuits are resources within Azure subscriptions.

Partners Requirements:

• Microsoft approved ExpressRoute Provider
• If your provider is not an ExpressRoute connectivity partner, you can still connect to the Microsoft cloud through a cloud exchange provider.

Network requirements:

• Redundant connectivity-Microsoft requires redundant BGP sessions to be set up between Microsoft’s routers and the peering routers, even when you have just one physical connection to a cloud exchange.
• Routing-ExpressRoute provider needs to set up and manage the BGP sessions for routing domains. Some Ethernet connectivity provider or cloud exchange provider may offer BGP management as a value-add service.
• NAT-Microsoft only accepts public IP addresses through Microsoft peering. If you are using private IP addresses in your on-premises network, you or your provider need to translate the private IP addresses to the public IP addresses using the NAT.
• QoS-Skype for Business has various services (for example; voice, video, text) that require differentiated QoS treatment. You and your provider should follow the QoS requirements.
• Network Security- consider network security when connecting to the Microsoft Cloud via ExpressRoute.

ExpressRoute Peering

• Private peering- The private peering domain is considered to be a trusted extension of on-premises core network into Microsoft Azure. You can set up bi-directional connectivity between your core network and Azure virtual networks.
• Public peering- In a simple terminology, the public peering is a network peering between public domain to on-premises DMZ and connect to all Azure services on their public IP addresses from company WAN without having to connect to the internet.
• Microsoft peering- ExpressRoute provides private network connectivity to Microsoft cloud services. Infrastructure and platform services running in Azure often benefit by addressing network architecture and performance considerations. Therefore, we recommend enterprises use ExpressRoute for Azure.
• Microsoft peering is used specifically for SaaS like Office 365 and Dynamics 365, were created to be accessed securely and reliably via the Internet. Therefore, we only recommend ExpressRoute for these applications in specific scenarios.

 Provisioning an ExpressRoute

Step1: Login and Select the subscription

Login-AzureRmAccount

Get-AzureRmSubscription

Copy the name of the subscription to be used for next command.

Select-AzureRmSubscription -SubscriptionId “Company Default”

Step2: Copy the name of the ExpressRoute Provider information to be used for next command.

Name, PeeringLocations, BandwidthsOffered, Sku

Get-AzureRmExpressRouteServiceProvider

Step3: Create new ExpressRoute

New-AzureRmExpressRouteCircuit -Name “On-premtoAzureCloud” -ResourceGroupName “ExpressRouteRG” -Location “Australia East” -SkuTier Standard -SkuFamily MeteredData -ServiceProviderName “Equinix” -PeeringLocation “Sydney” -BandwidthInMbps 200

Once you have created new ExpressRoute, you will see the below status of ExpressRoute.

NotProvisioned & Enabled, Provisioning & Enabled, Provisioned & Enabled

Step4: Record Subscription ID, service Key, Location and send this information to your ExpressRoute circuit provider to provision and activate services.

get-help New-AzureRmExpressRouteCircuit –detailed

Step5: List of All ExpressRoute and record the information for next command

Get-AzureRmExpressRouteCircuit -Name “ExpressRouteARMCircuit” -ResourceGroupName “ExpressRouteResourceGroup”

Step5: Connect a virtual network in the same subscription to a circuit

$circuit = Get-AzureRmExpressRouteCircuit -Name “MyCircuit” -ResourceGroupName “MyRG”

$gw = Get-AzureRmVirtualNetworkGateway -Name “ExpressRouteGw” -ResourceGroupName “MyRG”

$connection = New-AzureRmVirtualNetworkGatewayConnection -Name “ERConnection” -ResourceGroupName “MyRG” -Location “East US” -VirtualNetworkGateway1 $gw -PeerId $circuit.Id -ConnectionType ExpressRoute

Step6: Create Azure private peering for Azure Services

Make sure that you have the following items before you proceed with the next steps:

• A /30 subnet for the primary and secondary link. This must not be part of any address space reserved for virtual networks.
• A valid VLAN ID to establish this peering on. Ensure that no other peering in the circuit uses the same VLAN ID.
• AS number for peering. You can use both 2-byte and 4-byte AS numbers. You can use a private AS number for this peering. Ensure that you are not using 65515.

$ckt = Get-AzureRmExpressRouteCircuit -Name “ExpressRouteARMCircuit” -ResourceGroupName “ExpressRouteResourceGroup”

Add-AzureRmExpressRouteCircuitPeeringConfig -Name “AzurePrivatePeering” -ExpressRouteCircuit $ckt -PeeringType AzurePrivatePeering -PeerASN 100 -PrimaryPeerAddressPrefix “10.0.0.0/30” -SecondaryPeerAddressPrefix “10.0.0.4/30” -VlanId 200

Set-AzureRmExpressRouteCircuit -ExpressRouteCircuit $ckt

Get-AzureRmExpressRouteCircuitPeeringConfig -Name “AzurePrivatePeering” -Circuit $ckt

Step7: Configure Azure public peering for the circuit if you require a public peering refer to the explanation section.

• Make sure that you have the following information before you proceed further:
• A /30 subnet for the primary and secondary link. This must be a valid public IPv4 prefix.
• A valid VLAN ID to establish this peering on. Ensure that no other peering in the circuit uses the same VLAN ID.
• AS number for peering. You can use both 2-byte and 4-byte AS numbers.

Add-AzureRmExpressRouteCircuitPeeringConfig -Name “AzurePublicPeering” -ExpressRouteCircuit $ckt -PeeringType AzurePublicPeering -PeerASN 100 -PrimaryPeerAddressPrefix “12.0.0.0/30” -SecondaryPeerAddressPrefix “12.0.0.4/30” -VlanId 100

Set-AzureRmExpressRouteCircuit -ExpressRouteCircuit $ckt

Step8: Configure Microsoft peering for the circuit if you require a public peering refer to the explanation section.

• Make sure that you have the following information before you proceed:
• A /30 subnet for the primary and secondaary link. This must be a valid public IPv4 prefix owned by you and registered in an RIR / IRR.
• A valid VLAN ID to establish this peering on. Ensure that no other peering in the circuit uses the same VLAN ID.
• AS number for peering. You can use both 2-byte and 4-byte AS numbers.
• Advertised prefixes: You must provide a list of all prefixes you plan to advertise over the BGP session. Only public IP address prefixes are accepted. You can send a comma separated list if you plan to send a set of prefixes. These prefixes must be registered to you in an RIR / IRR.
• Customer ASN: If you are advertising prefixes that are not registered to the peering AS number, you can specify the AS number to which they are registered. This is optional.
• Routing Registry Name: You can specify the RIR / IRR against which the AS number and prefixes are registered.

Add-AzureRmExpressRouteCircuitPeeringConfig -Name “MicrosoftPeering” -ExpressRouteCircuit $ckt -PeeringType MicrosoftPeering -PeerASN 100 -PrimaryPeerAddressPrefix “123.0.0.0/30” -SecondaryPeerAddressPrefix “123.0.0.4/30” -VlanId 300 -MicrosoftConfigAdvertisedPublicPrefixes “123.1.0.0/24” -MicrosoftConfigCustomerAsn 23 -MicrosoftConfigRoutingRegistryName “ARIN”

Set-AzureRmExpressRouteCircuit -ExpressRouteCircuit $ckt

To Upgrade the SKU from metered to unlimited. Implement the below command to upgrade ExpressRoute SKU

$ckt = Get-AzureRmExpressRouteCircuit -Name “ExpressRouteARMCircuit” -ResourceGroupName “ExpressRouteResourceGroup”

$ckt.Sku.Family = “UnlimitedData”

$ckt.sku.Name = “Premium_UnlimitedData”

Set-AzureRmExpressRouteCircuit -ExpressRouteCircuit $ckt

Office 365 Hybrid Deployment with Exchange 2016 Step by Step

Hybrid Configuration Business Case.

• On-premises IRM- Information Rights Management (IRM) enables users to apply Active Directory Rights Management Services (AD RMS) templates to messages that they send.
• Antispam and malware protection- Mailboxes moved to Office 365 are automatically provided with antivirus and anti-spam protection by Exchange Online Protection (EOP), a service provided by Office 365. However, for corporate compliance reason, mail must flow through via on-premises anti-spam and firewall devices.
• Public Folder- You have on-premises public folder and you would like to retain on-premises public folder.
• Legacy Application- You have legacy applications that only support localised email server instead internet based email server
• On-prem UM- You have on-premises unified messaging infrastructure or telephony systems that only communicate with localised email servers
• Use of current CAPEX- You want to utilise current on-premises investment until the equipment expires and you are not ready to move into cloud completely.

In a hybrid deployment when you connect your Office 365 Exchange Online organization to your existing on-premises Exchange organization using the Hybrid Configuration wizard. After configuring the hybrid deployment, the following features are enabled:

• Secure mail routing between on-premises between the organizations.
• Mail routing with a shared domain namespace. For example, both on-premises and Exchange Online organizations use the @domain.com SMTP domain.
• A unified global address list (GAL), also called a “shared address book,” showing full details of recipients.
• Free/busy calendar information sharing between the organizations.
• Centralized control of inbound and outbound mail flow. You can configure all inbound and outbound Exchange Online messages to be routed through the on-premises Exchange organization.
• A single Outlook on the web URL for both the organizations.
• Automatic Exchange ActiveSync profile redirection when mailboxes are moved to Office 365 (dependent on device support).
• The ability to move on-premises mailboxes to the Exchange Online organization and vice versa.
• Centralized mailbox management using the on-premises Exchange Administration Center (EAC).
• Message tracking, internal MailTips and Out of Office replies, and multi-mailbox search between the organizations.
• Cloud-based message archiving for on-premises Exchange mailboxes. Exchange Online Archiving can be used with a hybrid deployment

A hybrid deployment involves several different services and components:

• Exchange 2016 Servers-   The Exchange 2016 Mailbox server role is required in your on-premises Exchange organization. All on-premises Exchange 2016 servers need to have the latest release of Exchange 2016, or the release immediately prior to the current release, installed to support hybrid functionality with Office 365.
• Office 365-   Hybrid deployments are supported with Office 365 Enterprise, Government and Academic plans.
• Hybrid Configuration wizard-   Exchange 2016 includes the Hybrid Configuration wizard which provides you with a streamlined process to configure a hybrid deployment between on-premises Exchange and Exchange Online organizations.
• Azure AD authentication system-   The Azure Active Directory (AD) authentication system is a free cloud-based service that acts as the trust broker between your on-premises Exchange 2016 organization and the Exchange Online organization. On-premises organizations configuring a hybrid deployment must have a federation trust with the Azure AD authentication system. The Hybrid Configuration wizard as part of configuring a hybrid deployment creates the federation trust. A federation trust with the Azure AD authentication system for your Office 365 tenant is automatically configured when you activate your Office 365 service account.
• Azure Active Directory synchronization-   Azure AD synchronization uses Azure AD Connect to replicate on-premises Active Directory information for mail-enabled objects to the Office 365 organization to support the unified global address list (GAL) and user authentication. Organizations configuring a hybrid deployment need to deploy Azure AD Connect on a separate, on-premises server to synchronize your on-premises Active Directory with Office 365.
• Active Directory Federation Services- AD FS provides simplified, secured identity federation and Web single sign-on (SSO) capabilities for end users who want to access applications within an AD FS-secured enterprise, in federation partner organizations, or in the cloud.
• Web Application Proxy Server- The Web Application Proxy under the Remote Access role that allows administrators to securely publish applications for external access. This service acts as a reverse proxy and as an Active Directory Federation Services (AD FS) proxy.

Hybrid infrastructure

To be able to configure your current on-premises Exchange organization for a hybrid deployment, the following components are required.

Exchange Server 2016 with Mailbox Role	EXCH2016
Exchange Server 2016 with Edge Transport Role	EXCH2016EDGE
Windows Server 2016 with Azure Active Directory Connect (AAD Connect) Installed	AADCONNECT
Active Directory Federation Server(s)	ADFS2016
Web Application Proxy Server in perimeter	EDGE2016
Domain Controller running on minimum Windows Server 2008 R2	DC01
Office 365 Subscriptions with default domain configured i.e. Service tenant FQDN	Domain.onmicrosoft.com
Accepted Domain in Office 365 and On-premises	Domain.com
On-premises domain type	Authoritative
Office 365 Domain Type	Internal Relay
User principal name domain and Microsoft Online ID domain	@domain.com
External Azure AD Connect with AD FS FQDN	sts.domain.com
On-premises Autodiscover FQDN	Autodiscover.domain.com
Office 365 Autodiscover	Autodiscover.outlook.com

Configuring Hybrid Exchange Server

Step1: Add and validate primary Email domain to Office 365

Perform the following steps to add the primary SMTP namespace to Office 365:

1. Log on to: Office 365 admin center preview
2. Click Settings > Domains > Add domain.
3. Enter the primary SMTP namespace. For example, domain.com. Then, click Next.
4. Copy the TXT record from the Wizard, go to domain management portal and add a text record ms=msxxxxxxx record and verify the domain. Setup TTL to 10 minutes. When complete, wait 10 minutes and then click Verify. If the wizard says it can’t verify your domain ownership, you might need to wait longer for your DNS records to update across the Internet; this might take several hours. Also verify that the record you created is correct.
5. On the Required DNS settings page, click Continue setup. Don’t update your DNS records right now. Instead, you’ll update your DNS records later in your hybrid deployment.
6. On the Set up your online services page, select I’ll manage my own DNS records and click Next.
7. On the Update DNS settings page, select Skip this step – I have custom DNS records, so I’ll add the records I need later. I understand that some Office 365 services may be unavailable until I manually add the records with my registrar. Click Skip, and then click Finish.

Step2: Setup Primary SMTP Domain to Internal Relay

Definitions of Domain Type

Authoritative – Selecting this option means that email is delivered to email addresses that are listed for recipients in Office 365 for this domain. Emails for unknown recipients are rejected.

Internal relay – Selecting this option means that recipients for this domain can be in Office 365 or your on-premises mail servers. Email is delivered to known recipients in Office 365 or is relayed to your own email server if the recipients aren’t known to Office 365.

Use the Exchange Online EAC to change the domain type

1. In the EAC, navigate to Mail flow > Accepted domains.
2. Select the domain and click Edit .
3. In the Accepted Domain window, in the This accepted domain is section, select the domain type. Edit the domain value to Internal relay.

Step3: Configure Active Directory synchronization

1. Download Azure Active Directory Connect on the computer where you’ll install it, and then open it.
2. On the Welcome page, click Next if you agree to the license terms and privacy notice.
3. On the Express Settings page, click Customize.
4. On the Install required components page, click Install.
5. On the User sign-in page, select Federation with AD FS and then click Next.
6. On the Connect to Azure AD page, enter the username and password for a user account that is a Global Administrator in your Office 365 organization , and then click Next.
7. On the Connect your directories page, select the Active Directory forest that contains the Exchange organization you want to configure for hybrid deployment, and then enter the username and password for a user account that’s a member of the Enterprise Administrators group in that forest. Click Next.
8. On the Domain and OU filtering page, select Sync all domains and OUs if you want to synchronize all of your on-premises Active Directory users to Office 365. If you want to select a specific organizational unit (OU), select Sync selected domains and OUs, and then select the Active Directory domains and OUs you want to synchronize. Click Next.
9. On the Uniquely identifying your users page, make sure that Users are represented only once across all directories is selected, and then click Next.
10. On the Filter users and devices page, make sure that Synchronize all users and devices is selected, and then click Next.
11. On the Optional Features page, select Exchange hybrid deployment, and then click Next.
12. On the AD FS farm page, select Configure a new Windows server 2016 AD FS farm.
13. In the Certificate File field, browse to the third-party certificate that includes a subject alternative name (SAN) that matches the external FQDN of the AD FS server. This certificate needs to include a private key. In the Subject Name field, select the SAN you want to use, for example sts.domain.com. Click Next.
14. On the AD FS Servers page, click Browse, select the name of the server where you’re installing Azure AD Connect with AD FS, and then click Add.
15. On the Web application proxy servers page, click Browse, select the name of the server that will act as a web proxy for external connections, and then click Add.
16. On the Proxy trust credentials page, enter the username and password of a user account that can access the certificate store on the AD FS server that contains the certificate you specified earlier in these steps, and then click Next.
17. On the AD FS service account page, select Create a group Managed Service Account, enter the username and password for a user that’s a member of the Enterprise Admins group, and then click Next.
18. On the Azure AD Domain page, select the domain that matches the custom domain that you added to your Office 365 organization and matches the User Principal Name users with which users will log in. For example, if you added the custom domain domain.com, and usernames are @domain.com, select domain.com from the list. Click Next.
19. On the Ready to configure page, select Start the synchronization process as soon as the configuration completes, and then click Next.
20. On the Configuration complete page, click Exit.
21. Make sure that your firewall is configured to allow connections on TCP port 443 from external sources to your AD FS web proxy server.
22. At this point, Azure AD Connect will synchronize your on-premises user accounts and their information to your Office 365 organization. Depending on how many accounts need to be synchronized, this might take a while.

Step4: Create Federation with Azure Active Directory

Remote into the Primary ADFS Server, Run the below cmdlets

Connect-MsolService
Set-MsolAdfsContext -Computer “adfsserver.domain.com”
Convert-MsolDomainToFederated -Domain “domain.com” -SupportMultipleDomain

If you have multiple userprincipalname, you have run the below cmdlets to federate with Azure AD.
Convert-MsolDomainToFederated -Domain “domain1.com” -SupportMultipleDomain
Convert-MsolDomainToFederated -Domain “domain2.com” -SupportMultipleDomain
Update-MsolFederatedDomain -Domain “domain1.com” -SupportMultipleDomain
Update-MsolFederatedDomain -Domain “domain2.com” -SupportMultipleDomain

Further reading ADFS Configuration Guide

Step5: Verify tenant configuration

To create a mailbox in the Exchange Online organization, do the following:

1. Open Active Directory Users and Computers on an Active Directory domain controller in your on-premises organization.
2. Expand the container or organizational unit (OU) where you want to create a new Active Directory user.
3. Click Action in the menu bar, and then click New > User.
4. Enter the required user information. Because this user will be associated with a test mailbox, we recommend that you clearly identify the user as such. For example, name the user “Test User”.
5. In the User logon name field, provide the user name that the user should specify when logging into their user account. This user name, combined with the user principal name (UPN) in the drop-down box next to the User logon name field, makes up the Microsoft Online Identity of the user. The Microsoft Online Identity typically matches the user’s email address, and the domain suffix chosen should match the federated domain configured in Active Directory Federation Services. For example, testuser@domain.com. Click Next.
6. Enter a password for the new user, specify any options you want to set, and then click Next.
7. Click Finish.
8. Run delta synchronization to synchronize the new user to the Office 365 organization  using this PowerShell Cmdlet. Start-ADSyncSyncCycle -PolicyType Delta
9. Log on to: Office 365 service administration portal
10. Assign a E1 or E3 license to the new user.

Step6: Install Edge Transport server

The Edge Transport server role is typically deployed on a computer located in an Exchange organization’s perimeter network and is designed to minimize the attack surface of the organization. The Edge Transport server role handles all Internet-facing mail flow, which provides SMTP relay and smart host services for the on-premises Exchange organization. Use Edge Transport servers if you don’t want to expose internal Exchange 2016 Mailbox servers directly to the Internet.

If you already have an Edge Transport server deployed in your on-premises organization, you can skip this checklist step unless you’d like to install additional Edge Transport servers.

Step7: Configure Edge servers

After installing the Exchange 2016 Edge Transport server, or if you already have an Edge Transport server in your on-premises Exchange organization, you must configure the following services and parameters to enable the Edge Transport server to handle secure communications between the on-premises Exchange servers, clients, and Office 365. If you already have an Edge Transport Server, skip this step.

Follow additional guidelines to Edge Transport Server.

Further References on Edge Transport Server.

Step8: Configure DNS

Hybrid requirement	DNS record	Record type	Value
Required for all hybrid deployments	autodiscover.domain.com	CNAME or A	If using CNAME DNS:  mail.domain.com If using Host A DNS:  External IP address of an Exchange 2016 Mailbox server or firewall
Recommended as a best practice for all hybrid deployments	SPF	TXT	v=spf1 include:spf.protection.outlook.com ~all
ADFS Public record	sts.domain.com	A	Public IP address of the AD FS web proxy server or firewall
Internal record by editing Hosts File located %SystemRoot%\system32\drivers\etc\HOSTS of WAP server	sts.domain.com	A	Internal IP address of the AD FS Servers

Step9: Firewall Configuration

If your organization uses Office 365 and restricts computers on your network from connecting to the Internet, below you’ll find the endpoints (FQDNs, Ports, URLs, IPv4, and IPv6 address ranges) that you should include in your outbound allow lists to ensure your computers can successfully use Office 365.

Hybrid deployment configuration changes may require you to modify security settings for your on-premises network and protection solutions. Exchange 2016 Mailbox servers must be accessible on TCP port 443, and Edge Transport and Mailbox servers must be accessible on TCP port 25. Other Office 365 services, such as SharePoint Online and Lync Online, may require additional network security configuration changes. If you’re using Microsoft Threat Management Gateway (TMG) in your on-premises organization, additional configuration steps will also be needed to allow full Office 365 integration in the hybrid deployment.

Step10: Configure Exchange Web Services

The external fully qualified domain name (FQDN) of your Internet-facing Exchange 2016 Mailbox server needs to be configured on several virtual directories for a hybrid deployment. By completing this checklist step, the external URL on the Exchange Web Services (EWS), Outlook Address Book (OAB), Outlook Web App (OWA), Exchange Control Panel (ECP), and the Exchange ActiveSync (Microsoft-Server-ActiveSync) virtual directories will be reset to the external FQDN of your Internet-facing Exchange 2016 Mailbox server.

Follow additional guidelines to configure web services.

Further References on Web Services.

Step11: Configure MRS Proxy

The Exchange 2016 Mailbox servers are the internet-facing servers for the organization, with a load balancer distributing traffic across them. Since those servers will be internet-facing for the Hybrid configuration, they need to be MRS Proxy enabled. Currently they are not MRS Proxy enabled, as seen here in the output of Get-WebServicesVirtualDirectory.

Get–WebServicesVirtualDirectory –ADPropertiesOnly | Where {$_.MRSProxyEnabled –ne $true} | Set–WebServicesVirtualDirectory –MRSProxyEnabled $true

Step12: Configure Exchange certificates

Digital certificates are an important requirement for secure communications between on-premises Exchange 2016 servers, clients, and Office 365. You need to obtain a certificate that will be installed on Mailbox and Edge Transport servers from a third-party trusted certificate authority (CA).

Before you can configure certificates on Exchange servers, you need to get a certificate from a trusted CA. Complete the following task on an Exchange 2016 Mailbox server if you need to generate a request for a new certificate for use with the hybrid deployment.

Follow additional guidelines to install certificates.

Further References on Exchange Certificates.

Step13: Run Hybrid Configuration wizard

The Hybrid Configuration wizard helps you establish your hybrid deployment by creating the HybridConfiguration object in your on-premises Active Directory and gathering existing Exchange and Active Directory topology configuration data. The Hybrid Configuration wizard also enables you to define and configure several organization parameters for your hybrid deployment, including secure mail transport options.

You can use the Hybrid Configuration wizard in the EAC on an Exchange 2016 server in your on-premises organization to create and configure the hybrid deployment.

1. In the EAC on an Exchange 2016 server in your on-premises organization, navigate to the Hybrid, In the Hybrid node, click Configure to enter your Office 365 credentials.
   At the prompt to log in to Office 365, select sign in to Office 365 and enter the account credentials. The account you log into needs to be a Global Administrator in Office 365.
2. Click Configure again to start the Hybrid Configuration wizard.
3. On the Microsoft Office 365 Hybrid Configuration Wizard Download page, click Click here to download wizard. When you’re prompted, click Install on the Application Install, Click Next, and then, in the On-premises Exchange Server Organization section, select Detect a server running Exchange 2013 CAS or Exchange 2016. The wizard will attempt to detect an on-premises Exchange 2016 server. If the wizard doesn’t detect an Exchange 2016 server, or if you want to use a different server, select Specify a server running Exchange 2013 CAS or Exchange 2016 and then specify the internal FQDN of an Exchange 2016 Mailbox server.
4. In the Office 365 Exchange Online section, select Microsoft Office 365 and then click Next.
5. On the Credentials page, in the Enter your on-premises account credentials section,  specify a different set of credentials, specify the username and password an Active Directory account you want to use. Whichever selection you choose, the account used needs to be a member of the Enterprise Admins security group.
6. In the Enter your Office 365 credentials section, specify the username and password of an Office 365 account that has Global Administrator permissions. Click Next.
7. On the Validating Connections and Credentials page, the wizard will connect to both your on-premises organization and your Office 365 organization to validate credentials and examine the current configuration of both organizations. Click Next when it’s done.
8. On the Hybrid Features page, select Full Hybrid Configuration and then click Next.
9. On the Hybrid Domains, select the domain or multiple accepted domains you want to include in your hybrid deployment. In most deployments you can leave the Auto Discover column set to False for each domain. Only select True next to a domain if you need to force the wizard to use the Autodiscover information from a specific domain.
10. Click Next.
11. On the Federation Trust page, click Enable and click then Next.
12. On the Domain Ownership page, click Click copy to clipboard to copy the domain proof token information for the domains you’ve selected to include in the hybrid deployment. Open a text editor such as Notepad and paste the token information for these domains. Before continuing in the Hybrid Configuration wizard, you must use this info to create a TXT record for each domain in your public DNS.
13. Click Next after the TXT records have been created and the DNS records have replicated.
14. On the Hybrid Configuration page, select the Configure my Edge Transport servers for secure mail transport option to configure your on-premises Edge Transport servers for secure mail transport with Office 365. Click Next.
15. If you want Office 365 to send all outbound messages to external recipients to your on-premises transport servers, select the Enable centralized mail transport check box in the More options section.The on-premises transport servers will be responsible for delivering the messages to external recipients. This approach is helpful in compliance scenarios where all mail to and from the Internet must be processed by on-premises servers. If this check box is not selected, Office 365 will bypass the on-premises organization and deliver messages to external recipients directly using the recipient’s external DNS settings.You select this option if you want to use your own Spam Filter.
16. On the Edge Transport Servers page, select the Edge Transport server you want to configure for secure mail transport. click Next. In this section, you have to provide the public IP addresses of edge servers or public FQDN of edge servers.
17. On the Transport Certificate page, in the Select a reference server field, select Exchange 2016 Mailbox server that has the certificate you configured earlier in the checklist.
18. In the Select a certificate field, select the certificate to use for secure mail transport. This list displays the digital certificates issued by a third-party certificate authority (CA) installed on the Mailbox server selected in the previous step. Click Next.
19. On the Organization FQDN page, enter the externally accessible FQDN for your Internet-facing Exchange 2016 Mailbox server. Office 365 uses this FQDN to configure the service connectors for secure mail transport between your Exchange organizations. For example, enter “mail.domain.com”. Click Next.
20. The hybrid deployment configuration selections have been updated, and you’re ready to start the Exchange services changes and the hybrid deployment configuration. Click Update to start the configuration process. While the hybrid configuration process is running, the wizard displays the feature and service areas that are being configured for the hybrid deployment as they are updated.
21. When the wizard has completed all of the tasks it can perform automatically, it’ll list any tasks that you need to address manually before your hybrid deployment configuration is complete.
22. The wizard displays a completion message and the Close button is displayed. Click Close to complete the hybrid deployment configuration process and to close the wizard.
23. You’ll probably need to configure the Receive connector on your Edge Transport server by doing the following.
    Open the Exchange Management Shell on your Exchange 2016 Edge Transport server.
    Run the following command to list the Receive connectors on your Edge Transport server. Make note of the Receive connector that’s listening on TCP port 25.Get-ReceiveConnectorRun the following command to configure the Receive connector. Replace the name of the Receive connector in the following command with the name of the connector you identified in the previous step.Set-ReceiveConnector “Edge\Default internal receive connector Edge” -TlsDomainCapabilities mail.protection.outlook.com:AcceptOorgProtocol -Fqdn “mail.domain.com”24. Additional Steps for Centralised Mailflow or Route all inbound-outbound emails through on-premises servers. You need to enable remote mailbox using enable-remotemailbox and set target address using set-remotemailbox for this each mailbox as user1@domain.mail.onmicrosoft.com where domain is your domain name in Office 365. You must run full sync after this on the AAD Connect Server. You must run start-edgesynchronization –Server EXCH2016MailboxServer on the Edge Transport 2016 Server

Step14: Send Connector and Receive Connector Configuration on the on-premises server

Use the EAC to create an Internet Send connector

1. In the EAC, navigate to Mail flow > Send connectors, and then click Add . This starts the New Send connector
2. On the first page, enter the following information: Name: To Office 365 and Type: Internet When you are finished, click Next.
3. On the next page, verify that MX record associated with recipient domain is selected. When you are finished, click Next.
4. On the next page, In the Address space section, click Add . In the Add domain dialog box that appears, in Fully Qualified Domain Name (FQDN), enter an asterisk (*), and then click Save. This value indicates that the Send connector applies to messages addressed to all external domains. When you are finished, click Next.
5. On the next page, in the Source server section, click Add . In the Select a Server dialog box that appears, select one or more Edge Transport Servers if you route email through Edge Server if not enter mailbox servers that you want to use to send mail to the Internet. If you have multiple Mailbox servers in your environment, select the ones that can route mail to the Internet. If you have only one Mailbox server, select that one. After you’ve selected at least one Mailbox server, click Add, click OK, and then click Finish.

Use the EAC to Create a Receive Connector to Receive Secure Messages from a Partner

1. In the EAC, navigate to Mail flow > Receive connectors. Click Add to create a new Receive connector.
2. On the New receive connector page, specify a name for the Receive connector and then select Frontend Transport for the Role. Since you are receiving mail from a partner in this case, we recommend that you initially route mail to your front end server to simplify and consolidate your mail flow.
3. Choose Partner for the type. The Receive connector will receive mail from a trusted third party.
4. For the Network adapter bindings, observe that All available IPV4 is listed in the IP addresses list and the Port is 25. (Simple Mail Transfer Protocol uses port 25.) This indicates that the connector listens for connections on all IP addresses assigned to network adapters on the local server. Click Next.
5. If the Remote network settings page lists 0.0.0.0-255.255.255.255, which means that the Receive connector receives connections from all IP addresses, click Remove 0.0.0-255.255.255.255 to remove it. Click Add EOP IP Addresses, and Datacentre IP Addresses add the IP address for your partner’s server, and click Save.
6. Click Finish to create the connector.
7. Run the below Cmdlets in Mailbox Server

Get-ReceiveConnector “Inbound from Office 365“ | Add-ADPermission -User “NT AUTHORITY\ANONYMOUS LOGON” -ExtendedRights “ms-Exch-SMTP-Accept-Any-Recipient”

8. Verify Receive Connector using below Cmdlets

Get-ADPermission -Identity “ Inbound from Office 365” -User “NT AUTHORITY\ ANONYMOUS LOGON” | where {($_.Deny -eq $false) -and ($_.IsInherited -eq $false)} | Format-Table User,ExtendedRights

9. Add Datacentre IP Addresses using this Link
10. Troubleshoot using this link

Step14: Create a test mailbox

You can use the Office 365 Mailbox wizard in the EAC on an Exchange server to create a test mailbox in Office 365. If you want to create more than one test mailbox, you’ll have to use this wizard for each test mailbox. You can’t use the wizard to create multiple test mailboxes.

1. Log into the EAC on an on-premises Exchange 2016 server.
2. In the EAC, navigate to Enterprise > Recipients > Mailboxes.
3. Expand the menu at the Add  control and select Office 365 mailbox.
4. On the New Office 365 mailbox page, specify the following settings:
   • First Name   Type the first name of the new user.
   • Initials   Type the initials of the new user.
   • Last Name   Type the last name of the new user.
   • User logon name   Type the user logon name of the new user and select the primary SMTP domain used for your other on-premises users. For example, @domain.com.
   • Mailbox type   Choose the type of mailbox to create. For example, User mailbox.
   • Password   Type the password.
   • Confirm password   Retype the password.
   • Make sure the Create an archive mailbox check box is not selected.
5. Click Save to continue.

6. Start-ADSyncSyncCycle -PolicyType Delta

Step15: Move or create mailboxes

You can use the remote move migration wizard in the Office 365 tab in the Exchange admin center (EAC) on an Exchange server to move existing user mailboxes in the on-premises organization to Office 365:

1. Open the EAC and navigate to Office 365 > Recipients > migration.
2. Click Add  and select Migrate to Exchange Online.
3. On the Select a migration type page, select Remote move migration and then click Next.
4. On the Select the users page, click Add , select the on-premises users to move to Office 365 and click Add, and then click OK. Click Next.
5. On the Enter the Windows user account credential page, enter the on-premises administrator account name in the On-premises administrator name text field and enter the associated password for this account in the On-premises administrator password text field. For example, “Domain\administrator” and a password. Click Next.
6. On the Confirm the migration endpoint page, verify that the FDQN of your on-premises Mailbox server is listed when the wizard confirms the migration endpoint. For example, “mail.domain.com”. Click Next.
7. On the Move configuration page, enter a name for the migration batch in the New migration batch name text field. Use the down arrow  to select the target delivery domain for the mailboxes that are migrating to Office 365. In most hybrid deployments, this will be the primary SMTP domain used for both on-premises and Office 365 mailboxes. For example, user@domain.com. Verify that the Move primary mailbox along with archive mailbox option is selected, and then click Next.
8. On the Start the batch page, select at least one recipient to receive the batch complete report. Verify that the Automatically start the batch and Automatically complete the migration batch options are selected. Click New.
9. While the mailboxes are being moved, you will see a status of Synching in the migration status for each mailbox moved to Office 365. After the mailbox move request reaches a status of Completed, the mailbox migration process is complete.

Step16: Test hybrid deployment connectivity

Testing the external connectivity for critical Exchange 2016 and Office 365 features is an important step in ensuring that your hybrid deployment features are functioning correctly. The Microsoft Remote Connectivity Analyzer is a free online web service that you can use to analyze, and run tests for, several Exchange 2016 and Office 365 services, including Exchange Web Services, Outlook, Exchange ActiveSync, and Internet email connectivity.