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
http://go.microsoft.com/fwlink/?LinkID=145187 . - 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
http://go.microsoft.com/fwlink/?LinkID=145192 . - 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
http://go.microsoft.com/fwlink/?LinkId=145379 .
Note: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.
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KB article 953990, AV at mscorwks!SetAsyncResultProperties . This update applies only to Windows Server 2003 SP2 and Windows Server 2008.