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A Sense of Security An Independent News writer tells of his switch from Windows to a 15-inch PowerBook,:  #147;Two months in, I have a prevailing sense of security and safety. There #146;s been not a sniff of system meltdown. The software and security updates are easy, convenient and (via broadband) fast. The sense of considerable computing power and massive processing going on is very evident, but it feels secure behind the OS X firewall and a router; and all with no need for antivirus software. #148; Aug 20 