Office 365 (Outlook 2016 for Mac) - Categorize an item

You can organize your messages, events, contacts, and other items (items: Units 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.

Categorize an item

  1. Select an item in the item list (item list: In 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.).
  2. On the Organize tab, click Categories.

    Organize tab - categories button

If you are not seeing the category you would like, you will need to create a new category.

Modify Existing Categories or Create New Categories

On the Home tab, click Categorize, then click Edit Categories...

TO: DO THIS:
Create a new category Click the plus symbol, enter a name for the category, and then select a color
Change the name of a category Double-click the category name that you want to change, and then enter the new name in the text box.
Change the color of a category Click the color that you want to change, and then select a different color.
Delete a category Select the category that you want to delete, and then click "-".

categories modification screen

Notes

Assign a Color to each Item Within a Calendar 

If you keep a lot of appointments and meetings on your Outlook calendar, adding color categories lets you scan and visually associate similar items. You might assign all personal items to the green category and all important items to the red category.

  1. Select Calendar from the bottom-left of your Outlook client.
  2. Create a new event or modify an existing event, using the steps above.
  3. Click on Categories.
  4. Select the color category you wish to assign to the calendar event.

When you assign a color category, that color is used as the item's background color on the calendar grid.

 Tip    You can change the name of any category. Click an appointment, meeting, email message, or contact, and then click Categorize. Select the appropriate category, or "Edit Categories..." to properly assign the category to the Outlook item.

Assign a Category to each Item Within a Calendar 

At this time, Outlook 2016 for Mac does not have the ability to assign a color to a calendar. But, you can make each calendar a different color by applying the same category to all the calendar items/events within that calendar.
  1. Select Calendar from the bottom-left of your Outlook client. Make sure only one calendar is checked within your list.
  2. Click Organize tab.
  3. Switch from Grid to List view by clicking on the List icon in ribbon above the displayed calendars.

    Grid to List

  4. Click on the first calendar item row to select it.
  5. Select Edit | Select All menu.
  6. Click on the Categories icon and select the category you want to assign to all the selected events.

    Organize tab - categories button

  7. Click Organize tab and switch List to Grid.
  8. Select the color category you wish to assign to the calendar event. (When you assign a color category, that color is used as the item's background color on the calendar grid.)
  9. Repeat these steps for each calendar.
  10. You can now view all your calendars together differentiated by color.

See also

Display all items in a category

Filter items by category

About organizing in Outlook