Development of Windows XP

Development of Windows XP:

Development of Windows XP started on February 5, 1999 in the form of Windows Neptune. Neptune was originally going to be the successor of Windows ME, though based on the NT kernel. Microsoft merged the teams working on Neptune with that of Windows Odyssey, Windows 2000's successor, in early 2000.^[1] The resulting project, codenamed "Whistler", went on to become Windows XP.^[2]

Development work on Windows XP was completed in August 2001, and the operating system was released on October 25 of that year.^[3]