In some scenarios when you have configured Exchange 2013 with Exchange 2010 or 2007, you may get this errors:
Error
The mailbox of user Migration.8f3e7716-2011-43e4-96b1-aba62d229136@kibtek.com that is located on a server that is running version 14 can’t be opened on a server that is running version 15.
Resolution:
On Exchange 2013 Server run the following cmdlet :
New-MoveRequest -Identity "Migration.8f3e7716-2011-43e4-96b1-aba62d229136@kibtek.com" -TargetDatabase "Mailbox Database 1414468119"
After the move of this particular mailbox completes then you will not see the error again