Key Speakers At The Microsoft Build Developer 2014 Conference [Getty Images]

Terry Myerson, executive vice president of operating systems at Microsoft Corp., speaks during the keynote address at the Microsoft Developers Build Conference in San Francisco, California, U.S., on Wednesday, April 2, 2014. Microsoft Corp. is adding a voice-controlled digital assistant called Cortana to its Windows Phone software, seeking to match a feature that's already available in Apple Inc. and Google Inc. smartphones. Photographer: David Paul Morris/Bloomberg via Getty Images

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