Here’s two good tips to configure the junk mail filtering in Outlook 2003 and 2007. There’s an easily overlooked checkbox that will automatically add everyone you e-mail to your “Safe Senders” list. There’s also a list of countries whose mail can be turned off – most of us can turn off mail from all countries except the US. (The column suggests leaving Canada turned on also. That’s fair. I like Canada.)
Follow the link for complete instructions and screen shots.