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Windows Operating System Names and version numbers

Windows Operating System Names and version numbers

Operating system Name Release version number
Windows 8.1 6.3
Windows Server 2012 R2 6.3
Windows 8 6.2
Windows Server 2012 6.2
Windows 7 6.1
Windows Server 2008 R2 6.1
Windows Server 2008 6
Windows Vista 6
Windows Server 2003 R2 5.2
Windows Server 2003 5.2
Windows XP 64-Bit Edition 5.2
Windows XP 5.1
Windows 2000 5

So, what do you think ?