title: Including a LOCATION field in an .ics calendar file stops Calendar on MacOS El Capitan communicating with Exchange Server
body: <p>This question relates to a question I asked previously (<a href="https://stackoverflow.com/questions/39651547/importing-ics-into-calendar-on-mac-el-capitan-breaks-connection-to-exchange-s">Importing .ics into Calendar on Mac (El Capitan) breaks connection to Exchange Server</a>). I have written a Python script to generate an .ics file that can be used to transfer calendar events into an Exchange calendar in the Calendar app on MacOSX (El Capitan). The .ics file produced validates using <a href="http://severinghaus.org/projects/icv/" rel="nofollow noreferrer">http://severinghaus.org/projects/icv/</a>. The events are imported into a separate calendar rather than into the default Exchange calendar and appear in Calendar as expected. However, after importing the events, Calendar is unable to sync the events to Exchange Server. This is particularly noticeable if I try to add an invitee; immediately, I get an error message saying that:</p>
  
  <pre><code>Calendar can’t save the event “event name” to the Exchange server.
  There was an error attempting to send your changes to the exchange server.
  </code></pre>
  
  <p>After lots of faffing around, it seems that including a LOCATION field in the .ics file stops Calendar communicating with Exchange Server.</p>
  
  <p>So, for example, the following .ics file will import an event into an Exchange calendar (perhaps called 'tempcal') in the Calendar app but the event isn't synced with the Exchange server and I can't then add an invitee:</p>
  
  <pre><code>BEGIN:VCALENDAR
  VERSION:2.0
  PRODID:-//Python iCalendar timetable//
  BEGIN:VEVENT
  SUMMARY:COURSE XYZ 2016-17 LECTURE 1
  DTSTART;TZID=Europe/London;VALUE=DATE-TIME:20161011T160000
  DTEND;TZID=Europe/London;VALUE=DATE-TIME:20161011T170000
  DTSTAMP;VALUE=DATE-TIME:20160923T021716Z
  UID:20161011160000/Introduction to my course@example.com
  LOCATION:TBA
  END:VEVENT
  END:VCALENDAR
  </code></pre>
  
  <p>...whereas the following .ics file works fine:</p>
  
  <pre><code>BEGIN:VCALENDAR
  VERSION:2.0
  PRODID:-//Python iCalendar timetable//
  BEGIN:VEVENT
  SUMMARY:COURSE XYZ 2016-17 LECTURE 1
  DTSTART;TZID=Europe/London;VALUE=DATE-TIME:20161011T160000
  DTEND;TZID=Europe/London;VALUE=DATE-TIME:20161011T170000
  DTSTAMP;VALUE=DATE-TIME:20160923T021716Z
  UID:20161011160000/Introduction to my course@example.com
  END:VEVENT
  END:VCALENDAR
  </code></pre>
  
  <p>This seems like utter madness from where I'm standing. Can anyone offer an explanation of what's going on? Perhaps more importantly, is there anything I can do to sort this out at my end (i.e. on the Mac) or do I need to get IT Support to sort is out at the Exchange Server end (and, if so, what should they do?)</p>