If you use Outlook and get tons of spam, then you should look at CloudMark SpamNet.
It is a free add-in to Outlook and it works great. I just can't count on the built-in Junk Mail filter to do a a good job. What is great about CloudMark is that everyone adds to the filter's database. From their site:
Just like Napster allowed us to share a central list of our favorite music, Cloudmark Spamnet allows us to share a central list of spam. Individually this reported spam isn't very powerful, but the collective reports of millions of email users networked together blocks virtually all spam on the Internet.
Give it a look, I've already watched it remove 133 spam messages since I installed in on Friday.
And did I already mention PocketKnife Peek? It lets you view the raw html and text of a message without opening it. Very very cool, and prevents those nasty i-frames from opening in your Outlook HTML mail messages. Get this one too!
Yup, I've been using this tool for about a month, and it's caught 230 spam emails! It rocks!
I use CloudMark it catches about 100 spam a week for me. It never has blocked anything I didn't want it too. It's pretty cool, while in outlook I see the spam hit my inbox then see it disappear, all by itself. I like the features and the ease of CloudMark service.