An interesting news coming from Microsoft that will not release a third service pack for Windows Server 2003.

Chrissy House, Windows Server Operation Manager, declared  “We have received inquiries from our customers and partners on whether or not there will be a need for a Service Pack 3 for Windows Server 2003. Microsoft will not have a SP3 release for Windows Server 2003".
Also the Extended Support for Windows 2000 Server will end on July 13, 2010, Windows Server 2003 and Windows Server 2003 R2 will move on to extended support phase after July 13, 2010.

Source :Support changes coming July 2010 for Windows 2000 Server and Windows Server 2003