Lync 2010 Server & Client January 2013 Update is Rolling Out

 

Updates seem related to joining meetings across non-federated organizations.

Lync 2010 (64bit client) 4.0.7577.4374: KB 2793351

Lync 2010 (32bit client) 4.0.7577.4374: KB 2793351

Lync Server 2010 4.0.7577.211: KB 2791665