In case you missed it, Microsoft recently released a support article which details a supported scenario for:
1) Installing OCS 2007 R2 on a Windows Server 2008 R2 server.
2) Installing OCS 2007 R2 into a Windows Server 2008 R2 Active Directory (i.e. at least one DC was upgraded to Windows Server 2008 R2).
Prior to this, OCS [...]


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