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Exchange 2013 CU6 Issue

There’s an issue with CU6 for Exchange 2013 in coexistence mode with exchange 2007. Quite specifically if you have it installed you might experience unexpected database failovers if you have a delegate on 2007 attempting to open a 2013 mailbox.

The issue is known and an interim update should be getting released soon. The current work around is to disable MAPI access to the Exchange 2013 server and use OWA until the update is available.

 

Update 9/9/2014: A fix is available from Microsoft:
http://support.microsoft.com/kb/2997209



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