Oooooooh. I know a few people who love the client version of this. If you have used this version please let me know how it works.
iHateSpam for Exchange was developed for the Exchange Admin. Control spam according to the needs of your company and your users iHateSpam for Exchange (V5.5, 2000 and 2003) is an easy install and up and running in minutes. Spam detection is in excess of 98%, with a low rate of false positives. Evaluation version available.