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REUTERSMicrosoft Corp CEO Steve Ballmer displays a Nokia Lumia 920 featuring Windows Phone 8 during an event in San Francisco, California October 29, 2012. REUTERS/Robert Galbraith (UNITED STATES - Tags: SCIENCE TECHNOLOGY BUSINESS)

REUTERSMicrosoft CEO Steve Ballmer speaks during the launch of Windows Phone 8 in San Francisco, California October 29, 2012. REUTERS/Robert Galbraith (UNITED STATES - Tags: SCIENCE TECHNOLOGY BUSINESS)

REUTERSMicrosoft CEO Steve Ballmer speaks during the launch of Windows Phone 8 in San Francisco, California October 29, 2012. REUTERS/Robert Galbraith (UNITED STATES - Tags: SCIENCE TECHNOLOGY BUSINESS)

REUTERSA Nokia Lumia 920 featuring Windows Phone 8 is displayed during an event in San Francisco, California October 29, 2012. REUTERS/Robert Galbraith (UNITED STATES - Tags: SCIENCE TECHNOLOGY BUSINESS)