Sinofsky also oversaw the development of the Microsoft-branded Surface tablets, which have struggled to gain traction, in particular the model that runs Windows RT, the Windows 8 version for ARM-based devices.
In December, Sinofsky disclosed that he would teach at the Harvard Business School this spring, and in Thursday's blog post he reiterated that he will continue being an Entrepreneur in Residence there, as well as "pursue other business and product development opportunities that arise."
In May of this year, he publicly defended Windows 8 sales, and in July struck a "retirement agreement" with Microsoft in which he received a payout for unvested stock. In return, he agreed to some concessions that, among other things, prevent him from working for certain Microsoft competitors and from speaking badly about Microsoft products.
Juan Carlos Perez covers enterprise communication/collaboration suites, operating systems, browsers and general technology breaking news for The IDG News Service. Follow Juan on Twitter at @JuanCPerezIDG.