Odyssey was a codename for a version of Microsoft Windows that was in development from early 1999 to early 2000. The goal was to develop a successor to the NT-based Windows 2000 that was developed for business users. The same codebase was going to be used in creating Windows Neptune, the "home" counterpart to Odyssey. Some builds of Neptune were compiled and leaked on the Internet, but there hasn't been any information about Odyssey builds. However, after the release of Windows 2000, the Neptune and Odyssey teams were combined with the Windows 2000 team to work on the "Whistler" project that was released in late 2001 as Windows XP.
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| MS-DOS/9x-based | 1.0 · 2.0 · 2.1x · 3.0 · 3.1x · 95 · 98 · Me |
| NT-based | NT 3.1 · NT 3.5 · NT 3.51 · NT 4.0 · NT 4.0 Embedded · 2000 · XP · XPe · Server 2003 · Fundamentals for Legacy PCs · Vista · Home Server |
| CE-based | CE 1.0 · CE 2.0 · CE 3.0 · CE 4.0 · CE 5.0 · CE 6.0 · Mobile |
| Upcoming | Server 2008 · 7 |
| Cancelled projects | Neptune · Odyssey · Nashville · Cairo |
| Other and related projects | OS/2, Singularity |
