In August 2013, Windows Operating System XP occupied about 60% market share by volume, ranking the first. Windows 7 ranked the second, with 27.28% market share by volume, only half of Windows XP. All Windows OP market share dropped a little in August, except for Windows 8.
In the recent 6 months, Windows market share kept decreasing from 96.52% to 91.32%. It was same with Mac, dropped from 0.36% to 0.31%. Linux went up a little in August.
In contrast, Embedded System increased from 2.73% to 8.1%, eating away Windows market share.