All versions of windows have 89.62% world market share according to hitslink.com (Nov 2008). see http://en.wikipedia.org/wiki/Microsoft_Windows for the compiled stats from various tracking sites.
Microsoft's OS is Windows.
Windows 7 is the name of new Microsoft's operating system.
Microsoft's operating system is Windows, of which XP, Windows 7 and 8, are just three examples.
Microsoft's first operating system named Windows was introduced on November 20, 1985. The Microsoft Windows operating system is now available in 137 languages.
Windows is a popular operating system, but it is made by Microsoft, not Apple.
I guess windows 7 is the latest version of operating system in MICROSOFT.
operating system
Windows is a microsoft product !
Microsoft Windows 7
Windows 7.
When Microsoft created Windows
When Microsoft created Windows