2010 Updates:

• Update for Standard/Enterprise edition Server
  977345 Description of Cumulative update for Office Communications Server 2007 R2: January 2010
• Update for Standard/Enterprise edition Server Back End
  977349 Description of the update package for Office Communications Server 2007 R2 database: January 2010
• Update for Unified Communications Managed API 2.0 Core Redist 64-bit
  977351 Description of Cumulative update for Office Communications Server 2007 R2, Unified Communications Managed API 2.0 Core Redist 64-bit: January 2010

Version: 6907.83
Knowledge Base (KB) Articles: KB968802
Date Published: 1/7/2010

Microsoft Office Communications Server 2007 R2 Hotfix KB 968802
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=b3b02475-150c-41fa-844a-c10a517040f4

Microsoft Office Communications Server 2007 R2 Group Chat Hotfix KB 977338

Version: 6907.83
Date Published: 1/7/2010

Microsoft Office Communications Server 2007 R2 Group Chat Hotfix KB 977338
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=e5924bf9-b042-4c53-b4a6-79c7e5c9749b