2.1. What Are Categories?
Categories are essentially metainformation that you can attach to Outlook items to help make it easier for you to organization and quickly discover those items. In essence, a category is no more than a keyword that is attached to an item. After you assign a category to an item, you can change the way your items are organized by sorting, filtering, or grouping your items based upon the category or categories that have been assigned to the item.
2.2. What Are Categories Good For?
As mentioned, categories are a kind of metainformation in which you assign certain Outlook items, such as e-mail, tasks, and notes to these categories that you name. (Note that Outlook items can be assigned to zero, one, or many ...