Here is a simple walk through on how to add public calendars to your outlook profile.
Within your outlook, go to the bottom left corner and click on the Folder List button (figure A). This will bring up additional folders that you do not normally see (Figure B).
If you expand public folders, you will see all of the public folders for your organization. These are all hosted on the Exchange server. If you would like to add a calendar to your profile you would browse down to the calendar and add it to your favorites.
In this case, you would expand Public Folders > All Public Folders > Calendars. Inside the calendars folder is the list of available calendars. Right click the calendar you want and select add to favorites. You will see the ‘add to favorites’ dialogue, and you just click add.
Once you have added the calendar to your favorites, you should be able to go to your calendars and the calendar you just added to your favorites should be listed under “other calendars.”
You should be able to repeat this process for any other public folder calendars that you want to add to your outlook profile.