In mid-December 2011, Microsoft released an update for Lync Server 2010. This flew under the radar for many people, including myself, because the update is distributed under the same knowledge base article (KB 2493736) and download link as the previous November 2011 CU4 update.
This was done to ensure that a couple of post-CU4 . . . → Read More: December 2011 Updates for Microsoft Lync Server