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Microsoft's Build Windows unit chief Steven Sinofsky speaks as he introduces the release of Windows 8 in Anaheim, California September 13, 2011.ALEX GALLARDO/Reuters

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Microsoft's Build Windows unit chief Steven Sinofsky speaks as he introduces the release of Windows 8 in Anaheim, California September 13, 2011.ALEX GALLARDO/Reuters

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The Photo Picker function of the Windows 8 tablet operating system is shown in this publicity photo released to Reuters September 13, 2011. Microsoft Corp handed out sleek new tablets running a test version of its touch-enabled Windows 8 at its annual developer conference Tuesday, aiming to spark excitement over the new operating system which it hopes will stem the tide of consumers switching to Apple Inc's iPad.HO/Reuters

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The keyboard of the Windows 8 tablet operating system is shown in this publicity photo released ot Reuters September 13, 2011. Microsoft Corp handed out sleek new tablets running a test version of its touch-enabled Windows 8 at its annual developer conference on Tuesday, aiming to spark excitement over the new operating system which it hopes will stem the tide of consumers switching to Apple Inc's iPad. REUTERS/Microsoft/HandoutHO/Reuters

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A Reuters reporter runs through a new test Microsoft Windows tablet running a version of its touch-enabled Windows 8, expected to be released in 2012, at the Build conference in Anaheim, California September 13, 2011.ALEX GALLARDO/Reuters

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Attendees walk near a sign for the Microsoft "Build" developer conference in Anaheim, California September 13, 2011. Microsoft Corp handed out 5,000 sleek Samsung tablet computers running a test version of Windows 8 at its annual developer conference on Tuesday, hoping to stoke excitement over its new operating system.ALEX GALLARDO/Reuters

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A general view shows the Anaheim Convention Center, the venue for the Microsoft "Build" developer conference, in Anaheim, California September 13, 2011. Microsoft Corp handed out 5,000 sleek Samsung tablet computers running a test version of Windows 8 at its annual developer conference on Tuesday, hoping to stoke excitement over its new operating system.ALEX GALLARDO/Reuters

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Attendees wait near an entrance to the Microsoft "Build" developer conference in Anaheim, California September 13, 2011. Microsoft Corp handed out 5,000 sleek Samsung tablet computers running a test version of Windows 8 at its annual developer conference on Tuesday, hoping to stoke excitement over its new operating system.ALEX GALLARDO/Reuters

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A Reuters reporter runs through an application on the new test Microsoft Windows tablet, running a version of its touch-enabled Windows 8, expected to be released in 2012, at the Build conference in Anaheim, California September 13, 2011.ALEX GALLARDO/Reuters

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