I just got called by a man claiming to be from Microsoft, saying that my computer had been been giving off errors and that he would need to connect into my computer to diagnose this.
Lots of red flags going up in my head as he made this claim. So since he obviously has my name and number, I challenged him to tell me more about my machine. He couldn't even get the operating system correct. So I told him he was full of B.S. He said I was full of B.S. and hung up.
So if you get any unexpected calls from Microsoft, assume that it is a scam.