Migration from Office 365 or Microsoft 365 mailboxes to G Suite using the G Suite Data Migration Service

Supported Environment

Microsoft 365, Office 365, Exchange 2016, 2013, 2010, 2007 or 2003.

Supported G Suite

G Suite Enterprise, Business, Basic, and Education accounts

G Suite Cost

Standard prices are shown. Google occasionally offers special discounts to some customers for both the Flexible and Annual Plan.

 Flexible PlanAnnual Plan
CommitmentNone1 year of service for licenses purchased at the start of the contract.
Billing cycle MonthlyMonthly
Monthly paymentG Suite Basic: USD 6 per user
G Suite Business: USD 12 per user
G Suite Enterprise: USD 25 per user
G Suite Basic: USD 6 per license
G Suite Business: USD 12 per license
G Suite Enterprise: USD 25 per license
Yearly totalG Suite Basic: USD 72 per user
G Suite Business: USD 144 per user
G Suite Enterprise: USD 300 per user
G Suite Basic: USD 72 per license
G Suite Business: USD 144 per license
G Suite Enterprise: USD 300 per license
Add usersAt any time for additional monthly costAt any time for additional monthly cost
Remove usersAt any time (reduces monthly cost)Only when you renew the annual contract. Until then, you pay for all purchased licenses.
Cancel serviceAt any time without a penaltyMust pay annual commitment (even if you cancel early).

Outlook requirements

Step1: Setup G Suite

To setup G Suite, you need three basic information and privilege to prove ownership of your domain.

  • Primary domain, e.g. mydomain.com
  • Verify Domain. When you sign up for G Suite, you can choose which type of verification record such as TXT, CNAME, MX record you want to use in the Setup Wizard.
  • personal username such as user1@mydomain.com
  • An email address which can be gmail email and can be changed later.

G Suite MX setup for your domain host

  1. Sign in to your domain’s account at your domain host.
  2. Need help? Contact your domain host’s Support team. Domain hosts are experts with MX records, and setup is a common task.
  3. Go to the section where you can update your domain’s MX records. It might be called something like “DNS Management,” “Mail Settings,” or “Advanced Settings.”
  4. Delete any existing MX records.
    If you can’t delete the existing records, change their priority number to 20 or higher.
  5. Add new MX records for the Google mail servers.

If your domain host limits the number of MX records, just add the first 2 records in this table.

Values for G Suite MX records

Name/Host/Alias Time to Live (TTL*) Record Type Priority Value/Answer/Destination
@ or leave blank 3600 MX 1 ASPMX.L.GOOGLE.COM.
@ or leave blank 3600 MX 5 ALT1.ASPMX.L.GOOGLE.COM.
@ or leave blank 3600 MX 5 ALT2.ASPMX.L.GOOGLE.COM.
@ or leave blank 3600 MX 10 ALT3.ASPMX.L.GOOGLE.COM.
@ or leave blank 3600 MX 10 ALT4.ASPMX.L.GOOGLE.COM.
  • Skip this step if you already verified your domain by another method (such as TXT record, HTML file, or meta tag).
  • Save your changes.

Step2: Test G Suite Email

  1. Sign in to admin.google.com with your G Suite username and password. 
  2. In the top right corner, click the App Launcher, Mail.

Step3 (optional): Setup Google Cloud Directory Sync (GCDS)

Setup Directory Sync to use existing authentication or on-premises Windows Domain Controller users.  With Google Cloud Directory Sync (GCDS), you can synchronize the data in your Google domain with your Microsoft® Active Directory® or LDAP server. Your Google users, groups, and shared contacts are synchronized to match the information in your LDAP server. 

Systems Requirements:

  1. Download GCDS
  2. A Google domain.
  3. Access to a Google domain super administrator account to authorize GCDS.
  4. Microsoft® Windows® (supported on Windows 7, Windows 8, Windows 10, Windows Server 2008/2012/2016).
  5. Linux®—If you’re using a 32-bit version of GCDS on a 64-bit Linux system, a 32-bit libc (such as libc6-i386) must be installed.
  6. Administrator access to your Google domain.
  7. LDAP administrator access to your directory server and familiarity with its contents as well as familiarity with the LDAP query language.
  8. Network administrator privileges and familiarity with your network and security settings for internal and outbound traffic.

Enable Authentication in Google Configuration Manager in Google Domain

Authorize access using OAuth

  1. Open Configuration Manager and click the Google Domain Configuration page.
  2. Click Authorize Now to set up your authorization settings and create a verification code.
  3. Click Sign In to open a browser window and sign into your Google domain with your super administrator username and password.
  4. Copy the token that’s displayed.
  5. In the Verification Code field, enter the token and click Validate.

Allow API Access in Google Admin Console

  1. Sign in to your Google Admin console.
  2. Sign in using your administrator account (does not end in @gmail.com).
  3. From the Admin console Home page, go to Security>API reference.
  4. To see Security on the Home page, you might have to click More controls at the bottom.
  5. Make sure the Enable API access box is checked.
  6. At the bottom, click Save.

Configure GCDS

  1. The simplest way to configure GCDS is to record credentials for Google Domain, On-premises Active Directory.
  2. Connect Google Domain and On-premises Active Directory
  3. Test connection
  4. Select an Organizational unit of Active Directory to Sync to Google Domain
  5. You’re done.

Step4: Assign Licenses

On the Licenses page of Configuration Manager, set up the GCDS license synchronisation for users in your Google domain.

If you have purchased different product SKUs for your domain, you may want to disable auto license assignment and use the GCDS license synchronisation feature to manage licenses for your Google user accounts. You should manage user license assignment using a single method. Either assign and manage product licenses through the Admin console or use the GCDS license synchronisation feature described here.

Additional Guide:

Step5 (optional): Setup Mailflow Co-existence between Office 365 and G Suite

Follow this guide to setup mailflow co-existence between Office 365 and G Suite.

Step6: Migrate email from Microsoft Exchange or Office 365

  1. Sign in to your Google Admin console.
  2. . Sign in using your administrator account (does not end in @gmail.com).
  1. From the Admin console Home page, go to Data migration. To see Data migration, you might have to click More controls at the bottom.
  2. Select the Email option and click Continue.
  3. On the Email Migration screen:
    1. From the Migration source list, select the Microsoft Exchange or Office 365 mail server that matches your legacy environment (where you’re migrating from). 
    2. Select the connection protocol of the legacy mail server by choosing an option:
      • To automatically determine the protocol, select Autoselect (Recommended).
      • To specify the Exchange Web Services URL for your legacy service, select Exchange Web Services and type the URL. The URL is the is the address that Exchange uses to communicate with Exchange Web Services, for example, https://outlook.office365.com/EWS/Exchange.asmx.
    3. Enter the email address and password for your role account.  
  4. Click Connect
  5. (Optional) If the connection fails, verify that the role account and connection protocol information is correct. Then, click Connect again. 
  6. In the Migration start date and Migration options sections, accept the default options or choose to exclude data that doesn’t need to be migrated. 
  7. Click Select Users.

Step7: Migrate a test email for a single user

  1. Complete the steps to set up the data migration service.
  2. Hover over Add and click Select user .
  3. In the Migrate From field, enter the user’s Exchange email address.
  4. In the Migrate To field, start typing the user’s new G Suite email address and choose from the list of suggested users. 
  5. Click Start.
  6. (Optional) To migrate another user’s email, repeat these steps. 
  7. To exit a completed migration, click Settings > Exit migration

Step8: Migrate email for multiple production users

  1. Complete the steps to set up the data migration service.
  2. Hover over Add and click Select multiple users.
  3. Click Attach File to upload a CSV file containing the legacy email addresses and the new G Suite email addresses. For details on how to format the file, see Use CSV files with the data migration service.
  4. Click Upload and start the migration.
  5. If there are errors in your file, choose an option:
    • To update the file, click Cancel, fix the file, and reload the updated file.
    • To ignore the incorrect mappings, check the Ignore errors box.

Notes: Formatting the CSV files

You can use a spreadsheet application, such as Google Sheets or Microsoft Excel®, or a text file to create the CSV file. Data in your CSV file is case-sensitive: make sure to use the correct case for emails, passwords, usernames, and resources.

Don’t include headers or use commas to separate the fields. Use line breaks to separate each entry.

Example CSV File

john.doe@googledomain.com,john.doe@microsoftdomain.onmicrosoft.com,calender1

In this example, you’re migrating john.doe@microsoftdomain.onmicrosoft.com (office 365) to john.doe@googledomain.com (G Suite) with a calender1 of Office 365.