Lync Server 2013 and the #Lync 2010 Client (Cross-post)
phyler
The latest published article I wrote for my employer:
http://pei.com/2013/02/lync-server-2013-and-the-lync-2010-client-2/
It is important to note that you should upgrade your Lync 2010 clients to the September 2012 update prior to moving the users over to the 2013 server.
Thanks!