I recently removed an LCS server from the domain, and have added a Lync Server. Everything installed correctly, but when I go to add users, I do not see any of the users that had been LCS enabled users. I believe the LCS attributes are still attached to the Active Directory objects. I think the Lync server is not showing me these users as potential new users to add, because of the left over LCS attributes on the AD accounts. Is it save to un-prep the domain/forest as talked about in the article below? And if so, will I be removing anything from the schema that may have been installed with the new Lync server?