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Development of Windows XP started in 1999 as a successor to the Windows Neptune and Windows Odyssey projects. 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 on August 24, 2001, and the operating system was released on October 25 of that year.[3]