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when did you last have virus? when did anyone last have one?
Ask a network admin the same question and you'll get a very different answer to here. I maintain a small number of computers running instruments in a scientific lab. We have more than 100 users of the lab, all coming with memory sticks and i can tell you that without an antivirus program we would not be functional. And even with the antivirus we get an infection once a year or so that it doesn't pick up and which i have to send to the antivirus company for ID and definitions updates.