Virus Protection Options

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In the aftermath of what seems to be an especially busy year (first half-year) of fending off viruses, Trojans, security holes, and so on, perhaps some people have some input as to the best protection software and/or procedures to protect our corporate networks. Personally, I’m in the process of evaluating various virus protection software, and will be updating accordingly. Norton, McAfee, and Trend Micro are the three on my evaluation list, so any feedback on the current versions would be appreciated. (Any suggestions over and above the three products mentioned are welcome as well.)