There are three things you can do to make your filter more efficient.
From the moment you open Outlook 2007, the Outlook Junk E-mail Filter reviews each arriving message, and sends any message that looks like spam to the Junk E-mail folder.
Any message that looks legitimate is routed directly to your Inbox.
You can do three things to improve your filter's performance:
Apply the updates that Microsoft creates for your filter, so that it always has cutting-edge information about what the junk senders are up to.
Choose the level of protection that you want your filter to provide.
Keep your filter’s three lists — the Safe Senders List, the Safe Recipients List, and the Blocked Senders List — up to date.
We’ll take these three processes in order. First, you’ll learn about applying Microsoft updates.