Thanks to Zorin OS's immunity to Windows viruses you will never have to worry
Hog Wash!! I can't see how they can make that claim. There is no software in the world that is safe from hackers. Where it is true that Linux is not directly effected by Windows viruses, there are viruses written to effect Linux. Just no where near as many. I feel it's because Linux and Mac are not as widely used as Windows is. And that's because it (as you so well put it) boils down to compatibility. Since Windows is the dominate OS out there, most of the software written is made to run on Windows.
Sure, many will say that windows get attacked because it's costs money and Linux is free. Okay, partially true. True that you can in fact download most versions of Linux for free. But false because some versions of Linux do cost money. Generally enterprise editions like Red Hat. And then there is Mac OS. It costs money too. But the user base is still so small compared to Windows and Linux. And the main reason for that is because it's not compatible with anything else and has so little software options.
Sorry about the rant. That statement just got me going.