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At the time of Windows XP's (NT 5.1) official release, Blackcomb was to be its successor. However, its introduction was pushed back several years after announcement of an interim version called Windows Longhorn.
Blackcomb is likely to include any new features Microsoft cannot release with Windows Longhorn.
| History of Microsoft Windows |
| Windows: 1.0 | 2.0 | 3.x | NT | 95 | 98 | Me | 2000 | XP | Server 2003 | CE | Pocket PC | Mobile | Longhorn | Blackcomb |