Can't speak highly enough of this freebie, to get rid od SPAM on Outlook Express. Its called SPAMFIGHTER download it for free here:
http://www.spamfighter.com/
My business mail box was being regularly spammed now it's virtually spam free. The idea is simple enough if you get SPAM blockit with SpamFighter and everyone else who uses Spamfighter automatically gets updated on the spam and the spam mail goes into the Spamfighter box unopened.
Nice bit of kit, give it a try.
Ocker