People might want to hold off on installing SP3 or RU6 for SP2. You will find that random users cannot normally delete voice messages, pdf attachments, calendar invite notifications and not able to see any Sent Items. I have a case open with Microsoft and they didn’t know when a fix will be released to the public. http://support.microsoft.com/kb/2822208
Unfortunately you have to install this if you want to install Exchange 2013 in your existing environment.
Blog by Raihan Al-Beruni 
People might want to hold off on installing SP3 or RU6 for SP2. You will find that random users cannot normally delete voice messages, pdf attachments, calendar invite notifications and not able to see any Sent Items. I have a case open with Microsoft and they didn’t know when a fix will be released to the public.
http://support.microsoft.com/kb/2822208
Unfortunately you have to install this if you want to install Exchange 2013 in your existing environment.
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good point. thanks
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