Required Operating System Updates

Microsoft Office Communications Server 2007 and Microsoft Office Communications Server 2007 R2 will reach end of support on January 9, 2018. To stay supported, you will need to upgrade. For more information, see Resources to help you upgrade your Office 2007 servers and clients.

To prevent coexistence issues during migration, the following operating system updates are required on all Office Communications Server 2007 servers with the exception of the Back-End Database Server for an Enterprise pool:

  • KB article 958561, Communications Server 2007 R2 remote users cannot make public switched telephone network (PSTN) calls when Communications Server 2007 servers or proxies are in the call path

  • KB article 958560, When a Communicator 2007 user calls a Conference Auto Attendant access number, the call always uses Mediation Server instead of going to the Conference Auto Attendant directly

  • KB article 953582, You May be unable to install a program that tries to register extensions under the IQueryForm registry entry in Windows Server 2008 or Windows Vista


    This update must be installed before you install Office Communications Server 2007 R2 administrative tools. It applies only to the Windows Server 2008 and Windows Vista operating systems.