Spam CSI - Crime Scene Investigator treats Spam like a crime and goes after the criminals. The program takes advantage of the fact that all spam messages contain web links, that they want you to click on. It scans your POP mailbox and investigates the links found in your new email messages and then crawls through their web site to look for evidence. It will then score both the email message and web site using a comprehensive 1,200 word database.

SpamBrave Lite for Outlook Express
A free Bayesian spam filtering plug-in for Outlook Express. Stops over 97% of spam.

Spam Reader
Spam Reader is an MS Outlook plugin that extends Outlook functionality with a Bayesian spam filter. Spam Reader analyzes each message when you receive it and puts it in the Spam folder if needed. The filter is self-trainable. Stops up to 98% of spam.

SPAMfighter Standard
Spam and phishing filter for Outlook and Outlook Express. Join the more than 700,000 SPAMfighters in 199 countries that have a clean inbox. SPAMfighter supports English, German, French, Spanish, Swedish, Norwegian, Dutch, Italian, Suomi and Danish.

SpamBrave for Outlook Express
SpamBrave is an Outlook Express plug-in that adds intelligent spam filtering functionality. No need to buy an expensive e-mail client with a Bayesian anti-spam filter. From now on, you can train your Outlook Express to filter spam.

SpamButcher
SpamButcher is an advanced anti-spam filter. It will solve your spam problem. Every few minutes it checks for new messages in your inbox. If it finds any spam, it's moved to a holding area for your later examination.