Microsoft CEO Steve Ballmer walks in front of a screen of computer manufacturers after his presentation at the launch of Microsoft Windows 8, in New York, Thursday, Oct. 25, 2012. Windows 8 is the most dramatic overhaul of the personal computer market's dominant operating system in 17 years. (AP Photo/Richard Drew)

Associated Press
Microsoft CEO Steve Ballmer walks in front of a screen of computer manufacturers after his presentation at the launch of Microsoft Windows 8, in New York,  Thursday, Oct. 25, 2012. Windows 8 is the most dramatic overhaul of the personal computer market's dominant operating system in 17 years. (AP Photo/Richard Drew)
Microsoft CEO Steve Ballmer walks in front of a screen of computer manufacturers after his presentation at the launch of Microsoft Windows 8, in New York, Thursday, Oct. 25, 2012. Windows 8 is the most dramatic overhaul of the personal computer market's dominant operating system in 17 years. (AP Photo/Richard Drew)
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