Lync 2010 Juli 2011 Cumulative Update (CU3)

July 2011 Cumulative Update (CU3) includes updates for server core components and client

Lync Server and components.

Lync Server 2010 Hotfix KB 2493736 (This is also the LyncServerUpdateInstaller)
Cumulative Update for Lync Server 2010, Core Components July 2011 KB 2571545
Cumulative Update for July 2011 Lync Server 2010 KB 2571546

Lync Client

Lync 2010 Client Hotfix:32 Bits 64 Bits