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As of June 23, 2010, Windows 7 has sold 150 million copies which made it the fastest selling operating system in history with seven copies sold every second.
On October 21, 2010, Microsoft announced that more than 240 million copies of Windows 7 have been sold.
My initial point is; Windows is loosing the OS battle with Vista and Win 7.
Altough I think stats on new machines sold with W7 VS upgrades from XP to W7 (including number of XPs out there) would be more telling on adoption rate.