I know plenty of people dumb enough to take this as proof. I worked with a young guy a few years back who was standing idly by while I discussed PCs and malware with another co-worker. Idle guy joins the conversation to tell us how just recently he avoided some malware himself after receiving a popup from Microsoft saying his PC was infected. The popup included a number on the screen, which he called.

Relieved to have Microsoft looking out for him, buddy calls the number and follows instructions to give the person on the other end remote access. After which, the malware is allegedly removed, and he's ordered to fork over $100 USD for the services rendered. Still relieved just to have Microsoft looking out for him like this, he forks over his fucking credit card information to pay for work. He finished the story with this very serious nod. A nod that said I really dodged a bullet there.

Poor blessed soul.