Caller ID showed "CALIFORNIA" -- a red flag.
Caller didn't leave a message.
Now blocked!

Claims my PC is reporting "serious errors", press 1 to speak with a Microsoft Certified Engineer. This is the same scam as when they called in person except now they have a robo caller to make it possible to reach more targets for their scam. Computers do not report errors to "their servers". Microsoft does not proactively monitor your PC. Other than malware or viruses, nothing legitimate will broadcast your data. These parasites just upped their game. Shut them down.

Said their name was Lisa and were calling from microsoft about serious errors on my computer.  I asked which one and she mumbled your desk top with windows 8.  I told her that all of my computers were fine and that I was getting no errors.  She hung up

Called before to inform me that "Dennis" works with Microsoft that sent a report that my computer is infected with a virus. Informed "Dennis" I don't have a computer, "Dennis" cut the call. Microsoft reports this as a scam.

Step father received call and claimed to be from Microsoft and they were receiving errors from our version of Windows.  He offered me the phone as I work in IT and they hung up when I answered.  This is clearly a scam