I am having trouble getting my Exchange Account in iCalendar to sync with my Outlook calendar. I am running on a OS X El Capitan 10.11.5 system  and 2011 Microsoft Outlook  with the latest update 14.6.5.

I have an error stating " Calendar can't refresh events in the calendar "Calendar". There was an error attempting to send your changes to the exchange server."

Do any of you know how to sort this problem out?