Microsoft itself (the real company) is also a scam.
How can you tell the difference here?
I love those kinds of calls, it gives me an opportunity to save souls.
"What a coincidence, I was just about to call you. You see, I'm God, and you have been giving off some errors yourself, sinner! Have you heard the word of the Lord? Do you want to be healed? For the low price of $19.99...."
I usually get a click by the time I get that far.
"Let us hope our weapons are never needed --but do not forget what the common people knew when they demanded the Bill of Rights: An armed citizenry is the first defense, the best defense, and the final defense against tyranny. If guns are outlawed, only the government will have guns. Only the police, the secret police, the military, the hired servants of our rulers. Only the government -- and a few outlaws. I intend to be among the outlaws" - Edward Abbey