Free client-side anti-spam plugin

Steve Bass sent out an email alerting me to the fact that Amazon is giving away an anti-spam plugin for Outlook. I haven’t used it myself, but Steve’s endorsement is good enough for me to recommend it, especially since the $19.99 product carries a $20 mail-in rebate. Check it out and let me know what you think.
Update: Sunbelt was described as a spammer by John Levine, among others; it looks like the world-famous rhyolist spam list contains several entries related to Sunbelt or Stu Sjouwerman, the owner. Stu is also a Scientologist.