To add a shared mailbox to exchange account in Microsoft Outlook for Mac:

1.    With outlook open, in the menu bar at the top of your screen, click on Tools and then Accounts





2.    In the account window that opens up, make the exchange account is highlighted on the left, and click on the Advanced button in the bottom right corner of the window:




3.    The window will change again - at the top are three options. We are going to pick the Delegates option in the middle.




4.    Now we are at the part where we actually add the shared mailbox.  On the bottom half of the Delegates screen, click the small “ + “ symbol under the box Open these additional mailboxes:.




5.    Type the email address you are looking for into the search box, and click Add once you’ve found it.




6.    Continue clicking OK until you are back at your inbox.  It may take a few moments for the new inbox to appear.  If it does not appear after several minutes, please quit Outlook and re-open it. You should be able to see all inboxes on the left side of the screen.