Codename for a version of Microsoft Windows under development in 1999
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Neptune
Version of the Windows NT operating system
Neptune build 5111's desktop
Developer
Microsoft
Working state
Historic, never released
Latest preview
5.00.5111 (kernel reports) 5.50.5111 (version in many files) / December 27, 1999; 24 years ago (1999-12-27)[1]
Marketing target
Consumer
Kernel type
Windows NT
License
Non-disclosure agreement[2]
Support status
Cancelled
Neptune was the codename for a version of Microsoft Windows under development in 1999. Based on Windows 2000, it was originally to replace the Windows 9x series[3] and was scheduled to be the first home consumer-oriented version of Windows built on Windows NT code. Internally, the project's name was capitalized as NepTune.[4]
^Thurrott, Paul (6 October 2010). "The Road to Gold: The development of Windows XP Reviewed". SuperSite for Windows. Penton Media. Retrieved 12 August 2014.
^Cite error: The named reference gold was invoked but never defined (see the help page).
^"Neptune - the new Windows". ZDNet. July 5, 1999. Archived from the original on 25 July 2008. Retrieved 2010-01-07.
^"Platforms Group - Desktop Three-Year Outlook" (PDF). Microsoft Corporation. February 1998. Retrieved 2010-01-08.
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