If you read 2600 (the people behind Defcon), you'll see why Macs haven't been targets, and it's not because of the 10 pct. market share, nor because of or in spite of Norton or anyone else. It's because hackers like hacking into corporations like the phone co., Walmart, etc., and also schools and the lesser-paranoid govt. agencies. And almost all business/govt. networks use PC's. Good hacking tools and skills are hard to come by, and those who are good are not going to waste time on Macs, until the tools and skills can port across with little effort.