The one that called here didn't even say what OS it was. To bad I wasn't the one that answered or the alarm bells would have rung louder and earlier. Though I did end up hanging up on him and calling Microsoft. The street sounds over the phone helped with making suspicious. Call centres would not have that sound and no call centre sounds at all. Bet he was in an internet cafe somewhere.
Seems this is happening a fair bit according to Microsoft. So beware after all it's head enough to get legit tech support. For them to call you? Not likely.