Categorize an item
You can organize your messages, events, contacts, and other itemsUnits of information in Outlook, such as e-mail messages, calendar events, contacts, tasks, and notes. by assigning them to categories. Because categories are color-coded, when you view the item list, it's easy to see which items belong to which category. You can assign an item to a standard category, such as Family or Travel, or to a category that you create.
If an item is assigned to multiple categories, the last category that is assigned is considered to be the primary category. The primary category determines the font color of the item in the item list. Also, when you sort items by category, an item is grouped with its primary category.
Select an item in the item listIn the main Outlook window, the list of messages, contacts, tasks, or other items. By default, the item list is displayed vertically between the navigation pane and the reading pane..
To select multiple items, hold down ⌘ as you click the items.
On the Home tab, click Categorize, and then click a category.
To create a new category, on the Home tab, click Categorize, click Add New, and then type a category name.