Windows Web Server 2008

Designed to be used specifically as a single-purpose Web server. Includes IIS 7.0, ASP.NET, and the Microsoft .NET Framework.

With support for 4 Processors, 4GB RAM (x86) or 32GB RAM (x64)

Windows Server 2008 Standard

Includes additional server functions such as DNS, RRAS and Virtualisation. Minimum required edition for standalone back-end SQL or Exchange Servers.

With support for 4 Processors, 4GB RAM (x86) or 32GB RAM (x64)
Includes 1 Virtual Image Use Right

Windows Server 2008 Enterprise

Includes additional server functions such as DNS, RRAS and Virtualisation. Minimum required edition for standalone back-end SQL or Exchange Servers.

With support for 8 Processors, 64GB RAM (x86) or 2TB RAM (x64)
Includes 4 Virtual Image Use Rights

Windows Server 2008 Datacentre

Designed to deliver an enterprise-class platform for deploying business-critical applications and large-scale virtualization on small and large servers. Reduces infrastructure costs by consolidating applications with unlimited virtualization licensing rights.

With support for 32 Processors (64 on x64), 64GB RAM (x86) or 2TB RAM (x64)
Includes unlimited Virtual Image Use Rights