To do this, right-click on the calendar and choose ‘Add to Favorites’ First, locate the calendar in a Public Folder, right-click on it and select Add to Favorites and then click the Add button to add it to your Public Folders Favorites. Requests for authorization to add a Public Folder need to go through your IT Support Staff.
This will mean that normal users cannot create new public folders, it will have to be done by an administrator. If you have only just created the public folder mailbox and root public folder it may take a few hours for the public folders to appear here.
Primarily using outlook 2010/2013 Exchange 2010 SP3 with update rollup 4 installed When a user goes into public folders, they can find the public folder calendar they want, right click, and add to favorites. user is able to re-add it, and all is well again...
At that point, it shows up under "Other Calendars" in outlook. Calendar works, they can do whatever they need, etc. until the next time they close outlook and re-open it.
You will need to create a Public Folder mailbox if you do not already have one.
This is done in the Now that you have a Public Folder Mailbox it’s time to create the root public folder. Click Public Folders at the top of the screen and click the plus button to create a new folder.
Read the Knowledge Base article on What Is An Autodiscover Record And Why Do I Need It? Note: Prior to opening Public folders in OWA, they need to be loaded in Outlook working in Online mode.