What I mean by version number is not necessary mean the OS name or service packs. For example, Windows 7, doesn't necessary mean it's the 7th version of Windows coming from Microsoft. As we have discussed before on our opinion of Why Windows 7 is named Seven. Here is a list of versions of Windows, since Windows Operating System 1.0. The distinguish of versions rather than OS names are important for developers and the distinguish of Windows structure.
the list of Windows OS by Version NumbersOperating System Version Number Other Information
Windows 1.0 1.04
Windows 2.0 2.11
Windows 3.0 3
Windows NT 3.1 3.10.528
Windows for Workgroups 3.11 3.11
Windows NT Workstation 3.5 3.5.807
Windows NT Workstation 3.51 3.51.1057
Windows 95 4.0.950
Windows NT Workstation 4.0 4.0.1381
Windows 98 4.1.1998
Windows 98 Second Edition 4.1.2222
Windows Me 4.90.3000
Windows 2000 Professional 5.0.2195
Windows XP 5.1.2600 Current SP3
Windows XP Professional x64 Edition 5.2.3790
Windows Vista 6.0.6000 Current Version changed to 6.0.6002 with SP2
Windows 7 6.1.7600 RTM
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