Note: You must be using the Outlook app for this to work.

Instructions

1. Share the shared mailbox calendar through Outlook Web Access (OWA) to the individual who wishes to access it.
2. Open the sharing invitation on your phone in the Outlook app.
3. In the sharing invitation, find the button that says Accept and tap it. Then click View.
4. Click on the Menu button and select the shared mailbox calendar. This should open the calendar on your phone.