It is complete nonsense indeed. There is not technical reason for virussen not to exist. 1. Most if not all Mac users are in the admin group. Meaning they (or

It is complete nonsense indeed. There is not technical reason for virussen not to exist. 1. Most if not all Mac users are in the admin group. Meaning they (or a virus or trojan running under their account) can modify for example /Applications/Mail.app without any warnings. 2. Mac users, like Windows users, download and run both legal and illegal software. They also love to share software. 3. Infecting UNIX binaries is extremely simple. Proof of concept virus can probably be written in two pages of C. This cocktail of user behaviour and a easily exploitable system makes it extremely easy to spread virusses or trojans. Why it is not happening? No idea. It could very well be market share.