E-mail is not just a business tool but a weapon of business terrorism. Research shows that one in every 617 spam messages now contains malicious code, one in every 169 bears a virus and one in every 229 is a phishing attack. "On average, we will intercept about 30 targeted Trojans per day," said one e-mail security expert. "In December 2005, that average would have been about two per week." Hear how companies are fighting this growing threat.