"Do the Math. One Million Macs per quarter cumulative for six years (24 quarters) plus all the candy G3 iMacs and Mac G3s and G4s that were converted to OS X? That could easily reach 25 million OS X Macs. I think with attrition, though, the number is probably closer to 22 million."
3 million in attrition over 6 years? Not likely
"Of course people have written code to attack Apples... but then could they get it to spread; did they find a vector other than psychological persuasion (Trojan Horse)? Not so far"
The link I posted had one case of 12,000 bad apples in 45 minutes.
Can't you read? The link you posted had 12,000 bad WINDOWS SERVERS in 45 minutes!
BlackICE Firewall runs ONLY ON WINDOWS. The Witty Worm infected WINDOWS COMPUTERS not Macs.