Was he sleeping with his biographer too? Steven Sinofsky, head of Microsoft’s Windows Division, announced his departure from the company Monday, effective immediately. The move comes just two weeks after Sinofsky led the launch of Microsoft’s Windows 8 and the Surface tablet. He had been with the company since 1989. Unnamed sources say the exit “came amid growing tension between Sinofsky and other top executives” and claim that many higher-ups thought he was “not the kind of team player the company was looking for.” Sinofsky had overseen the Windows Division since July 2009.