Exchange public folder calendar can't be opened in Microsoft Outlook

I'm trying to set up a shared Exchange public folder calendar in Microsoft Outlook. I would like everyone in the company to have permissions to access the calendar. I had no problem creating the Exchange public folder. However, when I try to open the calendar in Microsoft Outlook, the program tells me that the calendar could not be found. What am I doing wrong? Do I have to activate something or add something in the address book?