Microsoft may tout Windows 7′s growth curve, but the truth is that Windows XP rules the desktop, and will do so for many years.
The most recent report shows that Windows XP has more than twice the market share of Windows 7 and Windows Vista combined. Add Mac OS X to Windows Vista and 7 numbers, and XP still far outpaces them. Recent research shows that Windows XP had 61.87% of market share in July, compared to 14.46% for Windows 7, 14.34% for Windows Vista, 2.48% for Mac OS X 10.6, and 1.82% for Mac OS X 10.5. You can see the chart, below.