Yesterday, I too the plunge and upgraded my Exchange 2010 server from Windows Server 2008 SP2 to Server 2008 R2 SP1
All went well, and everything appeared to be working, it only took a few hours which was good.
However, when I checked my databases, I found that the System Mailbox DB (The one called “Mailbox Database xxxxxxx”) was dismmounted, and was refusing to remount itself..
After about an hour of checking, and failing, I eventually had to do a hard repair with eseutil /p and remove all the log files.
Fortunately, despite the copious warnings about data loss, I eventually got the thing mounted and all is well again.
So, if ever you decide to do this can I make one helpful suggestion to you all..
DISMOUNT ALL YOUR DATABASES FIRST TO ENSURE THEY ARE CLEANLY SHUTDOWN!
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