I just upgraded to O2k3 a few weeks ago in preparation for an AD/Exchange rollout in my company. I like it’s spam filter, but I am not impressed that it can’t learn. I’m now using SpamBayes and I really like how it handles spam, learning as it goes and using a “Suspected Spam” folder. The only problem is that it’s slow as anything when working on large amounts of spam (which I tend to get, having had my email address for 7 years). :?