Sources inside Microsoft say a clash of personalities led to Sinofsky's departure | The Verge

More Sinofsky exit speculation

"Critically, Sinofsky was not ousted because of any issues with the launch of Windows 8 or the Surface, sources tell us; in fact, it's possible that his departure was already planned, but his ability to execute on Windows 8's retail release was seen as an asset worth keeping him around long enough to see it through. But his attitude (and skill set) as an aggressive, tightly-siloed Windows boss — not a holistic Microsoft boss — may have done him in. Given that the future of Microsoft's ecosystem would require tight collaboration between disparate divisions, Sinofsky's future path as an executive at Microsoft was essentially at an end."

Sources inside Microsoft say a clash of personalities led to Sinofsky's departure | The Verge