engine - 5:31 pm on Nov 13, 2012 (gmt 0)

Here's Microsoft's official statement:

Microsoft Corp. today announced that Windows and Windows Live President Steven Sinofsky will be leaving the company and that Julie Larson-Green will be promoted to lead all Windows software and hardware engineering. Tami Reller retains her roles as chief financial officer and chief marketing officer and will assume responsibility for the business of Windows. Both executives will report directly to Microsoft CEO Steve Ballmer. These changes are effective immediately. Microsoft Announces Leadership Changes to Drive Next Wave of Products [microsoft.com]