Mac Guard was about keeping your machine safe. For them. Not for you. The year was 2008, and Fake AV was posting a profit in the world of PCs, thank you very much. So malware authors -- usually an equal opportunity bunch -- decided to make the same kind of offer available to Mac users. Various virus alerts would appear, and users would be urged to part with credit card information as the first step in making it all go away. The scam used a slightly adjusted version of a similar scam aimed at Windows users, and therefore did not fool a whole lot of people. But after picking themselves up and dusting themselves off, cybercriminals came back with a much more convincing pitch, sold as Mac Defender.