<ref>http://www.nextofwindows.com/a-list-of-windows-operating-system-version-number</ref><ref>http://www.computerhope.com/whow.htm</ref><ref>http://www.carrona.org/winreldt.html#31</ref><ref>http://windows.microsoft.com/en-US/windows/history#T1=era0</ref> | <ref>http://www.nextofwindows.com/a-list-of-windows-operating-system-version-number</ref><ref>http://www.computerhope.com/whow.htm</ref><ref>http://www.carrona.org/winreldt.html#31</ref><ref>http://windows.microsoft.com/en-US/windows/history#T1=era0</ref> |