With Category Manager you get all of your categories in a side-bar, a reminder service, synchronized with a central category list and much more.

OLKeeper reliably prevents users from closing their Outlook window and thus possibly missing reminders or e-mails

If you click on the button Reply to All, this free tool prompts you before the e-mail might be sent to the wrong recipients.

VBOffice Reporter calculates the sum of values from tasks, appointments, and journal entries with just a few clicks. These reports may be filtered, grouped, and exported into an Excel file