Outlook cannot access Public Folders on Exchange 2013

I just migrated Public Folders from Exchange 2007 to 2013. I'm trying to access Public Folders from Outlook 2007/2010 and I'm getting the following error when I select All Public Folders, "Cannot display the folder. Microsoft Outlook cannot access the specified folder location." When I try to expand All Public Folders I get these error "Cannot expand the folder, Microsoft Exchange is not available. Either there are network problems or the Exchange server is down for maintenance." I'm hoping for a quick easy fix.

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Vincent Sprague