High Quality Content by WIKIPEDIA articles! Development of Windows XP started in 1999 in the form of Windows Neptune. Windows XP was developed for 18 months, from December 1999 to August 2001, and was released on October 25, 2001. Neptune (build date of December 27, 1999 with a build number of 5111 was shown to selected groups of internal users and TechNet subscribers in 1999 (though it is still debated as to whether it was an alpha release or a Technology Preview). It was developed from the Windows 2000 codebase. "Neptune" was intended to be the next consumer version of Windows after Millennium. Only build 5111 was distributed outside of Microsoft.

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