Windows 7 has managed to surpass Windows Vista in total market share worldwide. According to Statscounter.com, "Windows 7 managed to take 20.09% total market share, while Vista has now sunk to 19.41% worldwide. Vista released to manufacturer in Nov 2006, and shipped to retail in Jan 2007. Windows 7 managed to surpass Vista in as little as 12 months, even with Vista being released more than two and a half years earlier, selling more than 175 million licenses."
Windows XP still dominates the market with 53.92%, but is quickly declining month-over-month as users are quickly adopting Windows 7. Windows XP has lost as much as 24% over the last year since Windows 7 has been released.