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But it didn't, really. NT 4.0 was followed by NT 5.0 (branded Windows 2000) and then by 5.1 (Windows XP) and then by 6.0 (Windows 7).

Vista was 6.0. Windows 7 was 6.1 and 8 was 6.2 (8.1 was 6.3). They finally bumped up the version to 10 with Windows 10.