Windows 2001

Windows 2001 (Codename Neptune) is released in April 22, 2001.

Editions

 * Windows 2001 Professional (2001-2014)
 * Windows 2001 PLUS! (2001-2008)
 * Windows 2001 Ultimate (2001-2008)
 * Windows 2001 Server (Neptune Server) (2001-2008)
 * Windows 2001 Ultimate Server (Odyssey)
 * Windows 2001 Pocket (2001-2008)