Table showing internal version numbers of the various versions of the Microsoft Windows kernel. The names in bold are those used by Microsoft to market the releases.
To reach "Windows 7", Microsoft appear to have grouped previous releases by their internal version number, but considered Windows 7 a major release of Windows, without bumping that internal version number.
| MS-DOS based Windows | Windows NT and successors | |||||
|---|---|---|---|---|---|---|
| Product | (Release) | Version | Product | Version | ||
| 1 | Windows 1.x | 1.01 | 1 | |||
| 1.02 | ||||||
| 1.03 | ||||||
| 1.04 | ||||||
| 2 | Windows 2.x | 2.03 | 2 | |||
| 2.1 | ||||||
| 3 | Windows 3.x | 3.0 | Windows NT 3.x | NT 3.1.528 | 3 | |
| 3.1 | NT 3.5.807 | |||||
| 3.11 | NT 3.51.1057 | |||||
| 4 | Windows 95 | Retail | 4.00.950 | Windows NT 4.x | NT 4.0.1381 | 4 |
| OSR 1 | 4.00.950A | |||||
| OSR 2/"95B" | 4.00.950B / 4.00.1111 | |||||
| OSR 2.5/"95C" | 4.00.950C / 4.03.1214 | |||||
| Windows 98 | Original | 4.1.1998 | ||||
| Second Edition | 4.1.2222 | |||||
| Windows Me | 4.9.3000 | |||||
| 5 | Windows 2000 | NT 5.0.2195 | 5 | |||
| Windows XP | NT 5.1.2600 | |||||
| Windows Server 2003 | NT 5.2.3790 | |||||
| 6 | Windows Vista | NT 6.0.6000 | 6 | |||
| Windows Server 2008 | ||||||
| Windows 7 | NT 6.1.7600 | |||||
| Windows Server 2008 R2 | ||||||
| Windows 8 | NT 6.2.9200 | |||||
| Windows Server 2012 | ||||||
| Windows 8.1 | NT 6.3.9600 | |||||
| Windows Server 2012 R2 | ||||||
| 10 | Windows 10 | NT 10.0 | 10 | |||
| Windows Server 2016 | ||||||
| Windows 11 | ||||||