Oliver Sommer 
2008-10-28

After enabling LCR DPM 2007 does not show the First Storage Group which is the one that gets LCRed in Exchange 2007 any more:

 

That's because DPM can't backup LCR when the VSS writer on that LCR DB is enabled.
So you need to disable the VSS replica Writer on that LCR DB:

You need to add the EnableVssWriter key as a DWORD with a value of 0 (NULL) to the Registry in HKLM/Software/Microsoft/Exchange/Replay/Parameters like shown in the following screenshoot.

After setting this key you need to restart the Exchange Replication Service to activate that setting:

Then you should be able to create a DPM protection group including Exchange LCR Mailbox protection:

 

This is also referenced here:

http://technet.microsoft.com/en-us/library/bb795725.aspx