Windows 2000 is a line of operating systems
produced by Microsoft for use on business
desktops, notebook computers, and servers.
Released on 17 February 2000, it was the
successor to Windows NT 4.0, and is the final
release of Microsoft Windows to display the
"Windows NT" designation.
Microsoft marketed Windows 2000 as the most
secure Windows version ever, but it became the
target of a number of high-profile virus attacks
such as Code Red and Nimda. Over ten years after
its release, it continues to receive patches for
security vulnerabilities nearly every month and
will continue to do so until 13 July 2010.
Windows 2000 was succeeded by Windows XP for
desktop systems in October 2001 and Windows
Server 2003 for servers in April 2003