So this thief has access to your filesystem, therefore your machine's passsword? You can't just pull out the hard drive and put it in another system, at least not with even just decent practices.
But the thief will also have your browser history, any saved passwords, and so on?
Obviously Microsoft isn't going to sell their profile of you to petty thieves. But they probably will sell it to at-scale-grifters looking for marks or fascists looking for dissidents.
But the thief will also have your browser history, any saved passwords, and so on?