SAN FRANCISCO, CA - APRIL 02: Microsoft CEO Satya Nadella walks in front of the new Cortana logo as he delivers a keynote address during the 2014 Microsoft Build developer conference on April 2, 2014 in San Francisco, California. Satya Nadella delivered the opening keynote to kick off the 2014 Microsoft Build developer conference which runs through April 4. (Photo by Justin Sullivan/Getty Images)
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