Open the Outlook app.
Navigate to 'Tools' and 'Accounts', either on the Mac system bar at the top of the screen or within the Outlook app itself.
Click on the '+' symbol at the bottom left of the pop-up window and select 'New Account'.
Enter the shared mailbox email address and click 'Continue'.
You'll be directed to the University of Cambridge login screen. Enter your email address in the format [CRSid]@cam.ac.uk and your UIS password, and then click 'Sign in'.
Click 'Done' and close the Accounts pop-up window, unless you need to add another shared mailbox.
Your shared mailbox should now appear in the list of mailboxes.
Open Outlook. The shared mailbox will appear on the left with your other mailboxes.