Odyssey was the codename and beta version of Microsoft Windows 2000 Advanced Server that was in the early stages of development by Microsoft during 1999. It was billed as the follow-up to Windows 2000, and was to be aimed at the business sector of the market.[1][2]

In early 2000, Microsoft merged the team working on Odyssey with that developing Windows Neptune (Beta Version of Microsoft Windows 2000 Home Edition), a consumer version of Windows 2000. The combined team worked on a new project codenamed Whistler,[3][4] which was later released as Windows XP.[5]

While there was one alpha build of Neptune, 5111, released to testers,[6] no version of Odyssey was ever released.[7] Paul Thurrott once suggested that it "would have been called Windows NT 6.0 had Microsoft not messed with the naming in late 1998",[8] whereas unnamed sources cited by ZDnet referred to it as "NT 5.5".[2]

See also


Windows 1.0Windows 2.0Windows 2.1 (Windows/286Windows/386) • Windows 3.0Windows 3.1x
Windows 9x
Windows 95Windows 98
Windows NT
Early versions
Windows NT 3.1Windows NT 3.5Windows NT 3.51Windows NT 4.0Windows 2000Windows 2000 Millennium Edition
Windows XP (development) • Windows Vista (editionsdevelopment) • Windows 7 (editionsdevelopment) • Windows 8Windows 10
Windows Server
Server 2003Server 2008 (2008 R2) • HPC Server 2008Home ServerSmall Business ServerEssential Business ServerWindows Server 2012Windows Server 2016
Windows EmbeddedWindows PEWindows Fundamentals for Legacy PCs
Windows MobileWindows Phone
MetroMidoriOS/2Windows AeroWindows SetupWindows XP themesMicrosoft Plus!

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