Chief Executive Officer Steve Ballmer Delivers The Keynote At The Microsoft Build Developer Conference

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Attendees Petru Jucovschi, left, and Ciprian Jichici look at Nokia... News PhotoCalifornia,Computer,Computer Equipment,Computer Programmer,Computer Software,Development,Electronics Industry,Finance,Horizontal,Microsoft,North America,Operating System,San Francisco - California,Technology,Telephone,The Americas,USA,Well-dressedPhotographer Collection: Bloomberg 2013 BloombergAttendees Petru Jucovschi, left, and Ciprian Jichici look at Nokia OYJ smart phones during the Microsoft Corp. Build Developers Conference in San Francisco, California, U.S., on Wednesday, June 26, 2013. Facebook Inc. is building an application for Microsoft Corp.'s Windows 8, adding one of the most popular programs still missing from the operating system designed to help Microsoft gain tablet customers. Photographer: David Paul Morris/Bloomberg via Getty Images