While once it was easy to ignore most warnings and scares as mere nuisances because most sites were isolated and unconnected, in today’s world, few computers stand alone. Viruses occur and spread with amazing speed, sometimes spanning the globe in hours or days (usually by stealing information, such as an email address book from one victim, and using it to infect others).
Even corporations that have secure perimeters can find themselves with significant internal virus problems. Often this is due to users who bring in infected laptops, use removable data drives, or burn information onto recordable CDs or DVDs that are infected and then brought into the office network.
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