operating system. Internal version numbers are used:
- Windows 10 - 10
- Windows 8.1 - 6.3
- Windows 8 - 6.2
- Windows 7 - 6.1
- Windows Server 2008 R2 - 6.1
- Windows Server 2008 - 6.0
- Windows Vista - 6.0
- Windows Server 2003 R2 - 5.2
- Windows Server 2003 - 5.2
- Windows XP - 5.1
- Windows 2000 - 5.0