Open Microsoft Outlook.
Click on the Folder list icon at the bottom of the Mail Navigation Pane to make the Public Folders appear in the pane, or Press (Ctrl + 6).
Click on All Public folders and locate the Calendar you wish to see. Right-click on that calendar and then click “Add to Favorites.”
Switch to the Calendar View in Outlook and the chosen calendar should be listed under Shared Calendars to select.