Each Microsoft Windows operating system has a familiar name, such as Windows 11 or Windows Vista, but behind each common name is an actual Windows version number1.
Every Windows version ever!
Below is a list of the major Windows versions and their version numbers:
[1] More specific than a version number, at least in Windows, is a build number, which often indicates exactly which major update or service pack was applied to that version of Windows. This is the last number shown in the version number column, such as 7600 for Windows 7. Some sources list the build number in parentheses, such as 6.1 (7600).
[2] Windows XP Professional 64-bit had its own version number of 5.2. To our knowledge, this is the only time Microsoft has designated a special version number for a specific edition and architecture type of a Windows operating system.
