If you trying to move mailboxes you may encounter the following error:

Exchange 2010 - couldn't switch the mailbox into sync source mode
Exchange 2010 - Couldn't switch the mailbox into Sync Source mode 1


Change the TCP KeepAliveTime for the servers involved in the move. Source, Target, and CAS.

KB: http://technet.microsoft.com/en-us/library/dd349797(v=WS.10).aspx

Hope it helps.

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