Updates that are released for Lync Server 2010

• Update for Administrative Tools
  2467771 Description of the update package for Lync Server 2010, Administrative Tools: January 2011
• Update for Core Components
  2514981 Description of the cumulative update for Lync Server 2010, Core Components: November 2011
• Update for Conferencing Attendant
  2575872 Description of the cumulative update for Lync Server 2010, Conferencing Attendant: July 2011
• Update for Conferencing Server
  2514978 Description of the cumulative update for Lync Server 2010, Conferencing Server: November 2011
• Update for Web Components Server
  2514979 Description of the cumulative update for Lync Server 2010, Web Components Server: November 2011
• Update for Standard/Enterprise edition Server
  2514980 Description of the cumulative update for Lync Server 2010: November 2011
• Update for Web Conferencing Server
  2575871 Description of the cumulative update for Lync Server 2010, Web Conferencing Server: July 2011
• Update for Mediation Server
  2640253 Description of the cumulative update for Lync Server 2010, Mediation Server: November 2011
• Update for Unified Communications Managed API 3.0 Runtime
  2500449 Description of the cumulative update for Lync Server 2010, Unified Communications Managed API 3.0 Runtime: November 2011
• Update for Policy Decision Point
  2502809 Description of the cumulative update for Lync Server 2010 Policy Decision Point : November 2011

Download Lync Server 2010 Hotfix KB 2493736
http://www.microsoft.com/download/en/details.aspx?id=11551

Updates that are released for Lync Server 2010 Group Chat

Lync Server 2010 Group Chat Hotfix KB 2514984
http://www.microsoft.com/download/en/details.aspx?id=5855

Lync 2010 Group Chat Admin Tool Hotfix KB 2636063
http://www.microsoft.com/download/en/details.aspx?id=22675

Lync 2010 Group Chat Hotfix KB 2636065
http://www.microsoft.com/download/en/details.aspx?id=11804