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1. Click any item (item: An item is the basic element that holds information in Outlook (similar to a file in other programs). Items include e-mail messages, appointments, contacts, tasks, journal entries, notes, posted items, and documents.).
2. On the Edit menu, click Categories.
3. Click Master Category List.
4. Click Reset.
5. Click OK twice.

Note  When you reset the Master Category List (Master Category List: The list of categories that you can use to group items or to find items. This list contains general categories such as Business, Personal, and Phone Calls. You can add categories to and delete categories from this list.), only the categories originally supplied with Outlook remain. All categories you added are deleted. These changes only affect the Master Category List. Items assigned to deleted categories keep their category assignments so you can find, sort, filter, or group them by those deleted categories.