I don't care what Mr. Frei says, I have lived with MS OS products since DOS, beta tested the Lisa and more recently personally owned both Tiger and Leopard on Intel based Apple hardware and someone is playing with the stats. Also, all 'vulnerabilities' are not equal and the need for 0-day patching is therefore not necessarily as great. Either of the recent Apple OS versions is infinately more stable and free from attack than anything I have used from MS in a decade. I re-boot my IMac monthly just to see if it will.