However, as a Mac OS X user, I am not invulnerable and I am still required by contract to install and use anti-virus software. And some of this is the economics of virus authoring. All this said, Macs are just not commonly known to be affected by viruses in the same sense that a Windows or DOS computer has been. In fact, a review of Secunia’s Vulnerability Report: Apple Macintosh OS X is a good exercise here.
This is not to say that a Mac user does not face many security threats - they do face threats, nor that they cannot be hacked - they most certainly can be hacked. One nice thing about working in a heavily Mac OS X environment, which most Ruby on Rails development companies are is that there just are not the number and variety of viruses on the platform as there are in the Windows environment.
When a contract requires anti-virus on all computers, even the Mac OS X systems, which do you choose? Macs are not Commonly Affected, in the traditional sense
