Neptune and Odyssey
Main articles:
Windows Neptune and
Windows Odyssey
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.
[1]
In early 2000, it was reported that the development teams working on Neptune and
Odyssey, an update to Windows 2000 for business users, had been amalgamated to work on a new project codenamed Whistler, which was eventually released as Windows XP