If you're serious about correspondence, you know you're only as good as your address list. Of course, once you've updated your address book, the last thing you want is to have it hijacked by a virus. Fortunately, ViraLock (30 days free, then $19.95) is a simple solution that encrypts both the e-mail addresses in your Outlook or Outlook Express address book and the addresses in your messages: It uses 128-bit key encryption, accessible only by a password you establish. Even if your machine is infected, a virus won't be able to get to the address book to propagate itself. Hover over an encrypted address and you'll see the contact's actual e-mail address.