Microsoft has released a couple of updates for Lync and Lync Server:
Microsoft Lync 2010 Attendee – User Level Install (version 7577.254)
Microsoft Lync 2010 Attendee – Admin Level Install (version 7577.254)
Lync 2010 Attendee Hotfix KB 2500438 (Admin level install) (version 7577.254)
Lync 2010 Group Chat Hotfix KB 2500446 (version 7577.253)
Lync 2010 Group Chat Admin Tool Hotfix KB 2500445 (version 7577.253)
Lync Server 2010 Group Chat Hotfix KB 2500447 (version 7577.253)
Microsoft Lync 2010 Phone Edition for Aastra 6721ip and Aastra 6725ip (version 7577.250)
Lync 2010 Attendant Hotfix KB 2496326 (version 7577.253)
Lync 2010 Attendee Hotfix KB 2500440 (User level install) (version 7577.254)
Microsoft Lync 2010 Phone Edition for Polycom CX700 and LG-Nortel IP Phone 8540 (version 7577.250)
Microsoft Lync 2010 Phone Edition for Polycom CX500, Polycom CX600 and Polycom CX3000 (version 7577.250)
Lync 2010 Hotfix KB 2496325 (32 bit) (version 7577.253)
Lync 2010 Hotfix KB 2496325 (64 bit) (version 7577.253)
Microsoft Lync Server 2010 Resource Kit