Windows Server 2008 SP1 x86 MSDN

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Includes:
 Windows Server 2008 Datacenter
 Windows Server 2008 Enterprise
 Windows Server 2008 Standard

Windows Server 2008 Datacenter
Windows Server 2008 Datacenter delivers an enterprise-class platform for deploying business-critical applications and large-scale virtualization on small and large servers. Improve availability with clustering and dynamic hardware partitioning capabilities. Reduce infrastructure costs by consolidating applications with unlimited virtualization licensing rights. Scale from 2 to 64 processors. Windows Server 2008 Datacenter provides a foundation on which to build enterprise-class virtualization and scale-up solutions.

Windows Server 2008 Enterprise
Windows Server 2008 Enterprise delivers an enterprise-class platform for deploying business-critical applications. Improve availability with failover clustering. Improve security with consolidated identity management features. Reduce infrastructure costs by consolidating applications with virtualization licensing rights. Windows Server 2008 Enterprise provides the foundation for a highly dynamic, scalable IT infrastructure.

Windows Server 2008 Standard
Windows Server 2008 Standard is the most robust Windows Server operating system to date. With built-in, enhanced Web and virtualization capabilities, it is designed to increase the reliability and flexibility of your server infrastructure while helping save time and reduce costs. Powerful tools give you greater control over your servers and streamline configuration and management tasks. Plus, enhanced security features work to harden the operating system to help protect your data and network and provide a solid, highly-dependable foundation for your business.