Windows Server 2003 (also referred to as Win2K3) is a server operating system produced by Microsoft, introduced on 24 April 2003. An updated version, Windows Server 2003 R2, was released to manufacturing on 6 December 2005. Its successor, Windows Server 2008, was released on 4 February 2008.
According to Microsoft, Windows Server 2003 is more scalable and delivers better performance than its predecessor
Windows Server 2008 (sometimes abbreviated as "Win2K8") is one of Microsoft Windows' server line of operating systems. Released to manufacturing on February 4, 2008, and officially released on February 27, 2008, it is the successor to Windows Server 2003, released nearly five years earlier. A second release, named Windows Server 2008 R2, was released to manufacturing on July 22, 2009. Like Windows Vista and Windows 7, Windows Server 2008 is based on Windows NT 6.x
