Think about how many people use Windows. Now think about all of those users multiplied by all of their activity. Now hook up to the stream of all that data (bec

Think about how many people use Windows. Now think about all of those users multiplied by all of their activity. Now hook up to the stream of all that data (because you know that the majority of those users won't go through the technical hassles of updating their settings). Now think about what you can do with that data. You can keep it internal and start to make really, really accurate predictions based directly off of users actions. And you get all that data for free.