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. 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, which was later released as Windows XP.