Top 7 Windows OS's

Extended support for Windows XP ended on April 8, 2014, after which the operating system ceased receiving further support or security updates to most users. As of June 2016, Windows XP desktop market share is 7.93% (and market share is higher in e.g. China at 26%, India; Asia in general and Africa), making it the fifth most popular after Windows 8.1 and OS X (though some statistics rank it third, at 10.90%, after Windows 10).

Source: StatCounter Global Stats - OS Market Share