I did notice that Exchange SP2 put in the "Intelligent Mail Filter" - what I believe in the default setup is what Outlook uses to quickly categorize junk mail. The only thing that concerns me about utilizing this to filter before hitting the inbox is that there is no quarantine option... it's either deliver, reject (bounce), archive (send to the global archive mail store) or delete. It would be a good interim solution, but I don't want to ever lose emails without the option to review them at least.