Enterprises can have mixed deployment of OCS 2007 and OCS 2007 R2 in which they install the OCS 2007 Admin Tools to manage servers/users for OCS 2007. If they attempt to use the OCS 2007 Admin Tools to manage users who are on an OCS 2007 R2 pool they will get the following misleading error:
"This user is enabled on a previous version of the product, and cannot be administered with this version of the Office Communications Server User Property Page. Please use the appropriate version of LCS MMC to administer the user. You may use the Office Communications Server Move User Wizard to move LCS 2005 SP1 users to Office Communications Server."
The OCS 2007 Admin Tools are only for managing users on an OCS 2007 pool.
The OCS 2007 R2 Admin Tools are only for managing users on an OCS 2007 R2 pool.