First, there is Mac malware.<p>Second, retail-level malware is a numbers game. Malware isn&#x27;t cross-platform. A malware author chooses their target based on how remunerative the target is. Windows remains more remunerative than OS X.<p>There is no fundamental difference between the security models of modern Windows and OS X that accounts for the disparity in malware infections.<p>(I&#x27;m a Mac user, and have been since ~2001.)