Got the same call as Mike.
He kept asking if who was the main user and got mad and raise his voice when I told him it was a family computer.
I told him not to raise his voice at me and hung up.

Never got a chance to ask him to many question, since my guard went up as soon as he told me that he was from MS and was a Tech.

First red flag came when he only knew the initial of my first name.
Second flag came when I remember that the computer came from my neighbor and my name should not be attach!