[This is pre-release documentation and subject to change in future releases. This topic's current status is: Milestone-Ready]

Topic Last Modified: 2010-07-14

Communications Server 2010 is available only in a 64-bit edition, which requires 64-bit hardware and the 64-bit edition of Windows Server. Client computers are not required to have 64-bit hardware or software.

All server roles of Communications Server 2010 require one of the following operating systems:

The Datacenter editions of Windows Server 2008 R2 and Windows Server 2008 SP2 are supported, but their use with Communications Server has not been fully tested by Microsoft.