When I asked who he's with, he said Microsoft. But, when I asked for a phone # that I can call ( just seeing what info. I could get from him), he said they're not tech support. He was wanting us to go to our PC, so I know he would then want us to click whatever to give him permission to remote in....So he can hack the PC, gather info. from it, etc...We've received calls like this before. If it were Microsoft, they wouldn't call us. We would have to call them. Even if they were to ever call us, they would gladly give us a number to call them back, which we could first research to validate. Plus, Microsoft wouldn't show "Unknown" on the caller ID.