A very good point, Jimbo, and thanks for bringing it up. We should not be complacent, especially when it comes to computer security. Regardless of the OS that we use, we should ensure that we have security program(s) installed, and that their database(s) is/are kept upto date. The reason why PCs running Windows are more susceptible to malware attacks than MACs or systems running Linux is simply a matter of economics - there are far more Windows-based machines out there than machines running an alternative OS, and therefore malware writers will get a bigger return by targeting the biggest market. That is not to say that the other OSes aren't targeted - they are, but not to the same extent as the potential returns are less.