Windows XP was launched almost 10 years ago, on August 24, 2001 and is still the world's most popular operating system. Windows Vista failed to become a replacement for XP, but Windows 7 is apparently eating away share from XP at an accelerating pace. However, Windows 7 cannot collect all those users that XP and Windows Vista are losing every month: XP and Vista lost a combined 1.57 points of OS market share in July, while Windows 7 gained just 0.74 points and now stands at 27.87 percent. Windows overall dropped to from 88.29 percent to 87.66 percent market share, while Mac OS X climbed from 5.37 percent to 5.59 percent and iOS is now estimated to hold 2.98 percent.
StatCounter, by the way, estimates Windows XP share at 43.89 percent and Windows 7 share at 36.06 percent.
A decrease in Windows XP market share and an increase in Windows 7 is critical for Microsoft to lay the foundation for greater IE9 and IE10 adoption to promote a new HTML5 app model that will arrive with Windows 8 in 2012.