Office Communications Server 2007 R2 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 Office Communications Server 2007 R2 Enterprise Edition require one of the following operating systems:
- The 64-bit edition of Windows Server 2008 Standard operating
system, or the 64-bit edition of Windows Server 2008 Enterprise
operating system
- The Windows Server 2003 R2 Standard x64 Edition operating
system with Service Pack 2 (SP2), or the Windows Server 2003 R2
Enterprise x64 Edition operating system with SP2
- The Windows Server 2003 Standard x64 Edition operating system
with SP2, or the Windows Server 2003 Enterprise x64 Edition
operating system with SP2