Although Microsoft Outlook 2003 includes robust junk mail filtering, spam continues to leak through. That's why you need another layer of defense. We asked our best spam reviewer, Dan Tynan, to look at five popular antispam solutions, including two past Editors' Choice recipients and two relative newcomers. Unfortunately, the latest version of our first Editors' Choice winner, McAfee SpamKiller 6.0 (2005), still uses a clunky third-party server to filter your mail and, frankly, hasn't kept up with the times. Norton AntiSpam 2005, the successor to last year's antispam award winner, works within Outlook but suffers from performance-robbing glitches. In fact, both McAfee and Norton kept Dan busy with technical-support calls, which can be expensive for you and me. We also heard a lot about Cloudmark's product, Cloudmark Desktop, but we were surprised to find it didn't perform as well as expected. That's why it's easy to declare a new Editors' Choice winner for best antispam app. Not only did MailFrontier Desktop 4.2 keep away the spam, it was also a cinch to set up and use. But hold on, Qurb 3.0 is a tight second. If anything, MailFrontier and Qurb both put Norton and McAfee to shame.