Windows Server 2008 SP2 Beta and Windows Vista Service Pack 2 Beta is prerelease code offered to the public through our Customer Preview Program. Please see the Windows Server SP2/Windows Vista SP2 Customer Preview Program page on TechNet/MSDN for additional details, documentation, and forums.

Windows Vista SP2 TechNet
Windows Server 2008 SP2 TechNet

Windows Server 2008 SP2 Beta and Windows Vista Service Pack 2 Beta apply to people, organizations, and technical enthusiasts who are comfortable evaluating prerelease software. This prerelease software is provided for testing only. Installation of Service Pack 2 Beta will result in Microsoft collecting information about the installation process, even if the installation is not completed. We do not recommend installing this software on primary or mission-critical systems. We recommend that you have a backup of your data before you install any prerelease software.

SP2 is an update to Windows Server 2008 and Windows Vista that addresses feedback from our customers and partners. By providing these fixes integrated into a single service pack, Microsoft provides a single high-quality update that minimizes deployment and testing complexity for customers.
In addition to all previously released updates, SP2 will contain changes focused on addressing reliability and performance issues, supporting new kinds of hardware, and adding support for several emerging standards. SP2 will also continue to make it easier for IT administrators to deploy and manage large installations of Windows Server 2008.

Service Pack 1 is a prerequisite for installing Service Pack 2. Please make sure that your system is running Service Pack 1 before you install Service Pack 2.
Windows Server 2008 SP2 Beta and Windows Vista Service Pack 2 Beta - Five Language Standalone version can be installed on systems with any of the following language versions: English, French, German, Japanese, or Spanish.

Support for Windows Server 2008 SP2 Beta and Windows Vista SP2 Beta can be received by visiting the Windows Server 2008 Service Pack 2 and Windows Vista Service Pack 2 TechNet forum.