Windows Server 2003

Windows Server 2003 is a version of Windows that is numbered 5.3.

Release Date
It was released to the public on April 24, 2003.

Mainstream
Windows Server 2003 ended mainstream support on July 13, 2010.

Extended
Windows Server 2003 ended extended support on July 14, 2015.

Sales
Windows Server 2003 was a success.