http://www.spamaid.com

SpamAid is an easy-to-use MS Outlook add-on to protect your Inbox from spam email. The program is based on Bayesian filtering technology. The program learns using your personal correspondence to increase the filtration accuracy. Quarantined e-mails are stored in a separate SPAM folder. Users can manage their friends and enemies lists or build their own filters. POP3, IMAP, HTTP and MS Exchange support....(Details)