1. Open Folders View:
In Outlook (classic), click the More Apps icon on the left navigation bar, then click Folders.
2. Navigate to the Calendar:
Scroll down to Public Folders.
Expand the folders by clicking the > icons until you locate the desired calendar.
3. Add to Favorites:
Right-click the calendar you want.
Select Add to Favorites… from the menu.
4. Confirm:
In the window that appears, click Add.
5. Access the Calendar:
Go to your Calendar page.
Find the calendar listed under Other Calendars.
Important Notes:
It may take up to 30 minutes for the calendar to also appear in:
Outlook Web (OWA)
Outlook for Mac
Outlook "New"
Mobile devices (iOS and Android) do not support public folder calendars.