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Updates that are released for Communications Server 2007 R2

• Update for Application Host
  967832 Description of the update package for Communications Server 2007 R2 Application Host: April 2009
• Update for Application Sharing Server
  971296 Description of the update package for Office Communications Server 2007 R2, Application Sharing Server: July 2009
• Update for Administration Tools
  971289 Description of the update package for Office Communications Server 2007 R2, Administration Tools: July 2009
• Update for Audio/Video Conferencing
  971793 Description of the update package for Office Communications Server 2007 R2, Audio/Video Conferencing Server: July 2009
• Update for Core Components
  971299 Description of the update package for Office Communications Server 2007 R2, Core Components: July 2009
• Update for Communicator Web Access
  969824 Description of the update package for Office Communications Server 2007 R2, Communicator Web Access: July 2009
• Update for Conferencing Attendant
  969822 Description of the update package for Office Communications Server 2007 R2, Conferencing Attendant: July 2009
• Update for Conferencing Announcement Service
  969823 Description of the update package for Office Communications Server 2007 R2, Conferencing Announcement Service: July 2009
• Update for Monitoring Server
  971298 Description of the update package for Office Communications Server 2007 R2, Monitoring Server: July 2009
• Update for Mediation Server
  969835 Description of the update package for Office Communications Server 2007 R2, Mediation Server: July 2009
• Update for Outside Voice Control
  967835 Description of the update package for Communications Server 2007 R2, Outside Voice Control: April 2009
• Update for Response Group Service
  967829 Description of the update package for Communications Server 2007 R2, Response Group Service: April 2009
• • Update for Standard/Enterprise edition Server
  969821 Description of the update package for Office Communications Server 2007 R2: July, 2009
• Update for Standard/Enterprise edition Server Back End
  969834 Description of the update package for Office Communications Server 2007 R2 database: July, 2009
• Update for Unified Communications Managed API 2.0 Core Redist 64-bit
  970679 Description of the update package for Office Communications Server 2007 R2, Unified Communications Managed API 2.0 Core Redist 64-bit: July 2009
• Update for Web Conferencing Server
  971297 Description of the update package for Office Communications Server 2007 R2, Web Conferencing Server: July 2009
• Update for Web Components Server
  967830 Description of the update package for Communications Server 2007 R2, Web Components: April 2009

Source: here