Windows Server 2003 Web Edition

Designed to be used specifically as a single-purpose Web server. Includes IIS 6.0, ASP.NET, and the Microsoft .NET Framework.

With support for 2 Processors and 2GB RAM – 32bit only

Windows Server 2003 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 and 4GB RAM

Windows Server 2003 Enterprise

Expands on Standard edition to include additional virtualisation rights, greater RAM and Processor support, unlimited RRAS and Terminal Services gateway connections.

With support for 8 Processors and 32GB RAM (64GB on x64)