OutBack Plus 

Protect your valuable Outlook data (email messages, contacts, contact manager DB, tasks, email accounts, signatures, message rules, etc) with a simple to use backup and restore utility.
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InBoxer for Outlook Spam 

Award-winning, personalized Outlook spam filter blocks junk e-mail while making sure that you see the messages you need. Uses Bayesian analysis and advanced techniques to build a filter based on your mail. New BlackBerry and Treo plug-ins. Free trial
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Active Scripting Fast Disable 

Block popup ads and Outlook email spam with this quick-toggle utility. Disable and enable Active Scripting and picture display in four different Internet Explorer security zones, with a single click or keypress. No setup is required.
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SPAMfighter 

SPAMfighter stops unsolicited spam mails before they reach your desktop. Take advantage of our peer-to-peer collaborative spam server to automatically stop spam. Works with Outlook and Outlook Express. Supports English, German, French, Spanish +
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TaskbarCalendar 

Pocket Calendar with Outlook integration. Accessible via the taskbar/system tray and keyboard shortcut. Shows appointments from Outlook in a small window with a single click or keystroke. Fast way of viewing / adding / editing Outlooks appointments.
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IdentaPop 

TAPI Caller ID popup program that overlays the Caller ID over your screen and slowly fades away. Ms Outlook screen pops for IP phones (Cisco, NBX,ESI etc) and modems.
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