Open a Shared Mailbox Calendar in Outlook app

If you are a delegate in a Shared mailbox and want to open the shared calendar in Outlook App, please follow these steps: 

1. Open Outlook

2. Click on the Calendar 

3. Right click on Other calendars

4. Select add a calendar 

5. Type the email address of the Shared Mailbox 

6. The calendar will now be listed in Outlook.