Unlike traditional virus hunter-killers, Viralock doesn't sniff out viruses, but instead encrypts E-mail addresses in Microsoft Outlook and Outlook Express, the two clients most often targeted by viruses and worms. Malicious code can't find and use the addresses to spawn additional copies and infect friends and co-workers.
Viralock can be downloaded directly from SentryBay for $19.95. Volume pricing is also available.