Satya Nadella, chief executive officer of Microsoft Corp., speaks during a keynote session at the Microsoft Worldwide Partner Conference in Washington, D.C., U.S., on Wednesday, July 16, 2014. Nadella, who took over from Steve Ballmer in February, said in an interview last week that Microsoft would have to become more focused and efficient and he is preparing to make sweeping changes at the company. Photographer: Andrew Harrer/Bloomberg via Getty Images