I use Microsoft Outlook yet my spam is out of control and doesn't go to the junk folder. I did some searching today and found this free add-on called SpamBayes and it works awesome! I trained it on about 4000 junk mails and 7500 good mails. So far today everything is working perfect. Good mails are delivered, junk i sent to the junk folder. It scores mails like Spam Assassin and has a "Junk Suspects" folder for ones it's not sure about so you can train it.
Anyway, check it out if you use Outlook. It's definitely worth the time.
http://spambayes.sourceforge.net/