www.netmarketshare.com/operating-system-market-share.aspx?qprid=10&qpcustomd=0
Windows 7 45.63%
Windows XP 33.66%
Windows 8 7.41%
Windows Vista 4.11%
Mac OS X 10.8 3.42%
Mac OS X 10.7 1.65%
Mac OS X 10.6 1.65%
Linux 1.52%
Mac OS X 10.5 0.39%
Windows 8.1 0.24%
Windows NT 0.09%
Mac OS X 10.4 0.09%
Mac OS X 10.9 0.05%
Windows 2000 0.04%
Mac OS X (no version reported) 0.01%

MacOSX全バージョン合計でもWindows8に負けてるくせに