Windows Odyssey

Windows Odyssey is a codename for a cancelled version of the Microsoft Windows operating system intended to succeed Windows 2000. It was later combined with Windows Neptune to create Windows XP.[1]

Windows Odyssey
A version of the Microsoft Windows operating system
Developer Microsoft
Working state Never released
Kernel type Windows NT
License Non-disclosure agreement[2]
Support status


Windows Odyssey was intended to replace the business-oriented Windows 2000. Development began in the 1990s and was based on Windows 2000.[1] The version number of Windows Odyssey is still unknown and unverified sources claim it as Windows NT "5.5" or "6.0".[3] Features found in Windows Odyssey was the new Activity Center and the new user interface.[1][4] However, due to high hardware requirements and because Windows Odyssey and the consumer-based Windows Neptune were based on the same codebase, Microsoft combined them to form codename "Whistler" which would later be Windows XP for efficiency.[1][5] No version of Windows Odyssey was officially released.[3]

Confidential documents from the Comes vs. Microsoft case do state that Windows Odyssey was indeed under development.[3]


  1. 1 2 3 4 "A (very) brief history of Windows XP". Neowin. Retrieved 2017-07-08.
  2. Thurrott, Paul. "Windows XP: The Road to Gold". SuperSite for Windows. Retrieved 2010-01-06.
  3. 1 2 3 "Windows:Odyssey - BetaArchive Wiki". Retrieved 2017-07-09.
  4. "The Road to Gold: The development of Windows XP Reviewed". Retrieved 2017-07-08.
  5. "Development Of Windows XP: An Introduction & Overview". McAkins Online. 2014-08-10. Retrieved 2017-07-08.
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