Email Audit 3.2
Email Audit is a reliable add-in utility for Microsoft Outlook 2000/XP/2003.Its helps to filter and cluster spam, junk, Newsletters and Bounce mails.The email audit utility comes with a host of built in spam control filters and flexible user defined filters.You can also create whitelist of email Ids for ensuring receipt of emails originating from preferred senders.Complements Outlook Rule implementations.

Junk-Out 2007 for Outlook 2007/2003 2.02
Junk-Out is an add-in for Microsoft Outlook that uses statistical (Bayesian) techniques to filter out junk e-mail (i.e. SPAM) from incoming messages.

Norton AntiSpam 2004
Symantec’s Norton AntiSpam 2004 filters unwanted email out of your inbox. Working with any POP3 email program, it filters incoming mail on multiple levels, detecting and flagging unsolicited messages while promptly delivering valid mail. To make your online time more enjoyable, Norton AntiSpam also blocks intrusive pop-up and banner ads.

Spam Trapper for Outlook 1.3.3
Spam Trapper is a multilevel spam filter for Microsoft Outlook version 2000 and later. It is a plug-in component with clear convenient interface. The first level checks your address book and validates all letters from your clients. So letters from your friends and colleagues are never processed as spam. The last level is a Bayes Filter. Any level can be switched off. Spam Trapper does not work with Outlook Express.

InBoxer for Outlook Spam 2.0
Award-winning InBoxer spam filter is top rated by reviewers around the world. Effectively blocks Outlook spam while making sure that you see the messages you need. How? InBoxer analyzes your mail folders to create a custom antispam filter just for you. New BlackBerry, Treo and handheld device plug-ins for spam-free remote access. Free trial.

Official Spam Filter for MS Outlook 1.2
Official Spam Filter for Microsoft Outlook is an easy to install spam filtering agent which works as a firewall against Spam Mails, Fraud Mails and Phishing Mails. Once installed, a new Anti Spam Toolbar with Anti Spam Filter options appears in Microsoft Outlook providing protection against Spam Mails. -Auto Learning Bayesian Algorithm -White List of Trusted Email Ids -Individual Marking Spam/NotSpam -Custom Black List and much more

Nelson Email Organizer - NEO 2.5.1
A plug-in for Microsoft Outlook 97/98/2000/2002(XP), NEO works with Outlook message stores and Exchange mailboxes. Spot important emails in the daily flood. NEO automatically categorizes email messages from your correspondents separately from Bulk mail, Ezines and Lists. With a single click NEO can hide all the junk and show only the emails from real people! NEO's Active Mail and To-do folders give you a better way to action your email.

JunkWarden-Dewqs for Outlook Express 4.44
Dewqs' NMS is a powerful anti spam filter discreetly working within Microsoft Outlook Express. It detects spam as it hits your IN-box, and stores it in a Quarantine folder. Reporting occurs when you decide. Protection of privileged folders. You can the quarantine folder at the touch of a button. And if you don't use Outlook Express, try our sister product, NMS for Outook.

Dewqs' NMS for Outlook 4.44
JunkWarden [Dewqs' NMS for Outlook] is a powerful anti spam filter working within Microsoft Outlook. It detects spam as it hits your IN-box, and stores it into a Quarantine folder. Reporting occurs when you decide. You can then empty the quarantine folder at the touch of a button. And if you don't use Outlook, try our sister product, JunkWarden for Outlook Express!

Spam Reader 2.5
Spam Reader is an MS Outlook plugin that extends Outlook functionality with a Bayesian spam filter. There is no need to run an external program. Spam Reader fully integrates into MS Outlook. Spam Reader analyzes each message when you receive it and puts it in the Spam folder if needed. SpamReader does not break existing Outlook filtering rules. The Bayesian spam filter is self-trainable. You can also tune it up for better accuracy.