Another product currently dubbed "Centro"-- a set of server software aimed at mid-size businesses -- will also be available in only a 64-bit version when it comes out around 2007. The Longhorn version of Small Business Server will also be 64-bit only, Muglia said.

Microsoft is working with the industry to transition to 64-bit computing, Muglia said. "We are on the verge of a major platform transition in the server marketplace," he said.

Windows Installer 3.0 is required. Windows Installer 3.1 or later is recommended.
o IE 5.01 or later: You must also be running Microsoft Internet Explorer 5.01 or later for all installations of the .NET Framework.
o 64-bit support: 64-bit CPU support requires the latest 64-bit version of either Windows XP Professional \Windows Server 2003. This framework is designed for the supported 64-bit Operating System. It contains both the 64-bit and 32-bit runtime in one convenient setup. For 32-bit operating systems, please click the related resource link for the 32-bit framework download page.
# Disk Space Requirements: 280 MB (x86), 610 MB (x64)