You're going to get this error in later versions of Exchange because you allowed the TO field to auto-complete instead of choosing the name from the GAL. Clear out the TO field and only add people to the field using entries from the GAL. … [Read more...] about Calendar sharing is not available with the following entries because of permission settings on your network.
No chit chat here, just a quick explanation of how to add a Public Folder Calendar to your GAL in Exchange 2013. The quick answer: Mail Enable the Public Folder item. Once the Public Folder item is mail enabled you'll be able to see it in the GAL. Here's how to mail enable an item using the GUI: Head to Public Folders > Public Folder > Drill Down to the Public Folder Item (Contacts & Calendars are most popular) and highlight the item. On the right hand side you'll see an option … [Read more...] about Exchange 2013: Adding An Outlook Public Calendar to the GAL / OAB