Open a public or shared folder in Outlook. Depending on your operating system and version of Outlook, these instructions may vary slightly.

...

Open a Public Folder in Outlook on Windows

1. Open the Outlook.
2. Click on the ellipses in the bottom left hand corner of the application.
   Image Added
3. Select Folders from the menu. 
   Image Added
4. You will now see a new section in the navigation bar on the left side of the screen called Public Folders - your email address. Click on the arrow to expand the section and then select All Public Folders.
   Image Added
5. The public folders are listed in alphabetical order by department. Select the appropriate folder. 
6. To quickly access the folder/calendar in the future, right-click on the desired Public Folder, and select Add to Favorites.

Open a Public Folder in Outlook on Mac

1. Open Outlook.
2. Select the Tools ribbon at the top of your application.
   
3. Search for the public folder or calendar you are looking to access.
   
4. To quickly access the folder/calendar in the future, select the calendar name and choose Subscribe.