Windows 7 is now for sale around the world. Microsoft CEO Steve Ballmer is officially kicking off the Windows 7 launch at an event in New York City. Microsoft's partners will be unveiling new hardware and OEMs are now no longer recommending Vista to consumers and are switching their default choice to Windows 7. Today is easily the most important day for Microsoft this year (the operating system's RTM date of July 22, 2009 comes in at a close second place). Here's everything you need to know about what's happening today.

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