Here is a list of all of the July 2009 OCS R2 Updates:

971296  Description of the update package for Office Communications Server 2007 R2, Application Sharing Server: July 2009
971289  Description of the update package for Office Communications Server 2007 R2, Administration Tools: July 2009
971793  Description of the update package for Office Communications Server 2007 R2, Audio/Video Conferencing Server: July 2009
971299  Description of the update package for Office Communications Server 2007 R2, Core Components: July 2009
969824  Description of the update package for Office Communications Server 2007 R2, Communicator Web Access: July 2009
969822  Description of the update package for Office Communications Server 2007 R2, Conferencing Attendant: July 2009
969823  Description of the update package for Office Communications Server 2007 R2, Conferencing Announcement Service: July 2009
971298  Description of the update package for Office Communications Server 2007 R2, Monitoring Server: July 2009
969835  Description of the update package for Office Communications Server 2007 R2, Mediation Server: July 2009
969821  Description of the update package for Office Communications Server 2007 R2: July, 2009
969834  Description of the update package for Office Communications Server 2007 R2 database: July, 2009
970679  Description of the update package for Office Communications Server 2007 R2, Unified Communications Managed API 2.0 Core Redist 64-bit: July 2009
971297  Description of the update package for Office Communications Server 2007 R2, Web Conferencing Server: July 2009

969695  Description of the update for Communicator 2007 R2: July 2009

970275  Description of the Office Communicators Server 2007 R2 Attendant hotfix rollup package: July 2009

 

You can see a list of all of the hotfixes here:
968802  List of available updates for Communications Server 2007 R2

 These updates will be available on Microsoft Update.