Data Protection Manager 2007 (DPM), Exchange 2007 and LCR

Okay, DPM 2007 installed fine on Windows Server 2008 (after performing some IIS modifications, see previous post). Installing the backup agents on the servers I wanted to backup went fine, too.

But when I wanted to backup my Exchange 2007 storage group I got this screen:
DPM-no-SG
Do you see the storage group? Neither did I.

What happened?

Very simple, when using Local Continuous Replication on Exchange 2007, you have to set a registry key:
Under HKLMSoftwareMicrosoftExchangeReplayParameters create a DWORD named EnableVssWriter and assign the value 0. It is described here. After restarting the Microsoft Exchange Replication Service the storage group appeared in DPM:
DPM-SG

I could re-enable LCR and then both worked fine, DPM and LCR.

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