Note: You must be using the Outlook app for this to work.
Instructions
- Share the shared mailbox calendar through Outlook Web Access (OWA) to the individual who wishes to access it.
- Open the sharing invitation on your phone in the Outlook app.
- In the sharing invitation, find the button that says Accept and tap it. Then click View.
- Click on the Menu button and select the shared mailbox calendar. This should open the calendar on your phone.