Exchange 2013 cu6 issues being tracked

I don’t know how much this impacts standalone Exchange 2013, but
hybrid/mixed installs with Exchange 2007 appear to be having issues.

(from the bottom of

Issue Reported: Ryan reported on my blog that they are facing an issue
with CU6 in exchange 2007 mix mode here. Any confirmation will be

Following issue reported.
Do not install this CU6 if you have a 2007COEX with EX13. Were having
major issues with databases flapping. This is due to EX07 mailboxes
talking to EX13 mailboxes. MS are aware of this and working on a fix now.

@PrabhatNigam – Yes, we became aware of this issue earlier today. This
happens when a 2007 user attempts to access a delegated mailbox that is
on a 2013 server. This issue is being tracked by KB2997209, that is
still being published.

The EXPTA {blog}: Don’t Deploy Exchange 2013 CU6 If You’re a Hybrid

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