In my Exchange Environment I have two servers, Exchange 2007 and Exchange 2013.
My public folders located on Exchange 2007 and my mailbox located on Exchange 2013.
Once I click to the public folders I receive and error.
'cannot expend thee folder. The set of folders cannot be opened. Microsoft Exchange is not available. Either there are network problems or the Exchange server is down for maintenance.'
At the same time user that his mailbox located on the Exchange 2007 can acsess the public folders.