Outlook provides 20 default categories for you, but you may want to create your own. Here's how:
- Select one or more messages to assign to a category.
- Choose File, Categories (or right-click the items and choose Categories from the shortcut menu).
- Click in the Item(s) Belong To These Categories box and type the new category name (if you want to type more than one, separate the names with a comma).
- Click Add To List.
- Click OK.