In lieu of the July updates appearing on Windows Update today, in case you missed it, a round of Lync server and clients updates were released at the end of July – collectively referred to as Cumulative Update Package 3 (CU3).
I have heard of several issues in the field recently that were addressed by updates to the core components.
Server Updates
Lync 2010 Server (KB2571546) Lync Core Components (KB2571545)
Client Updates
Lync 2010 Client (KB2571543) Lync 2010 Phone Edition for Polycom CX700 and LG-Nortel IP Phone 8540 (KB2577593)