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 [...]
If you are deploying OCS 2007 or 2077 R2, and especially if you are migrating from LCS 2005, you will want to be careful about setting the OCS AD attribute msRTCSIP-OptionFlags. This is an important AD attribute which is typically set by manually enabling/disabling specific user features in the OCS Administrative Console, or programmatically through [...]