Overview:
This tutorial is for adding additional mailboxes into the MacOS version of Outlook. You may need use this tutorial to add a shared functional account which you have been given permissions to access through a -fullaccess or -editor group.
Add a shared mailbox to Outlook on MacOS
Step 1:
With Outlook open, select Accounts... listed in the Tools drop down menu.

Step 2:
In the Accounts window select your Default account.

Step 3:
Select the Delegates & Sharing tab.

Step 4:
Click on the + sign in the Shared With Me window

Step 5:
Enter the additional mailbox you wish to open and click Add when it is selected.

Note: You may have to quit Outlook & restart the program for the newly added mailbox to populate. Upon logging back into Outlook, you should have the account listed below your primary account. You may have to scroll down on the left pane to see it.
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