Windows Server 2003

Windows Server 2003 is the server counterpart of Windows XP. It comes in editions like Datacenter, Web Server, Standard, Enterprise and Small Business (the latter is technically a separate version). It replaces Windows 2000 Server and was replaced by Windows Server 2008.

Codenames
Its internal codenames were either dotNET (.NET) Server (As evidenced in the Windows buildtree, where its source is located at D:\dnsrv) and during the development of Windows XP, it was codenamed Whistler Server.

Release 2
An interim release under the name of Windows Server 2003 R2 was released on 2005-12-06.

Other versions
As well as the standard Windows Server 2003, several other editions were built on the NT 5.2 kernel, including Storage Server 2003 R2 (released 2006-03-05), Compute Cluster Server 2003 (released 2006-06-09), Small Business Server 2003 R2 (released 2006-09-01) and Unified Data Storage Server 2003 (released 2006-12-05).