Exchange 2013 OWA and public calendars

The new reduced functionality of Exchange 2013 OWA public folders was an unpleasant surprise for my users.  (And for me.  If I had caught that in the documentation we would have stayed with 2010.)  We have a few shared calendars in the public folders that people really rely on.  Does anybody have any ideas for a substitution, 3rd party software, anything??

Thanks,

John