Said they were from Microsoft and my computer is reporting a problem. Then asked me if I was at my computer - female with Indian accent. When I confirmed she was from Microsoft, I said "My computer is running Linux. Does that make a difference?" She hung up.
This number called at 7:18 am!! Since I didn't recognize the number, I figured it was a scam and didn't answer. I called the number back later and it said it was disconnected.