I have a strange issue with my new Lync 2013 environment. I had previously deployed a test environment for Lync 2013 as a proof of concept. Once it passed with administration, I decided I would restore my Lync VMs back to a pre-Lync state using snapshots. I then reinstalled Lync, taking advantage of my lessons learned during the first build. I'm more than happy with the new environment, except for one thing. When I go to enable Lync users, the users that I enabled in the proof of concept days cannot be found. I have decided that this probably has something to do with the fact that Lync thinks these users are already Lync-enabled users. I'm guessing that Lync writes some attributes to a user's AD account when it enables it for Lync. Does anyone have experience with this, or know how I can "reset" these previously enabled accounts to work in my new environment?