We've spoken about Rahul Sood before. He joined Microsoft back in 2010, making it official in 2011. Back then this man was asked, as he puts it, "to join Microsoft with the mission to create or be part of something amazing." He did that, it's done, and he's leaving the company now a little under four years later. And what'll have left behind at Microsoft? A massive undertaking - something that wasn't there before he arrived. Now he heads to a whole new company entirely.