OCS 2007 R2 Support for Windows Server 2008 R2

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 [...]

Can you install OCS 2007 in a Windows 2008 AD Domain?

The answer is yes, but I ran across a scenario that might save folks some time. If OCS is running in a Windows 2003 forest, and one or more domain controllers were upgraded to Windows 2008, OCS will not work correctly.

You can resolve the situation by running a forest prep. Page 8 of the Microsoft [...]