There was an error attempting to send your changes to the exchange server.

iCal will no longer sync with my work Exchange calendar.
I have deleted and added the account several times, but that is not working.
I was getting messages about specific events not being synced with the server, but now I get the following message:
"Calendar can't refresh with the account "RPD Exchange"
There was an error attempting to send your changes to the exchange server"
Any ideas?
Thanks.

Just hit this issue, with 10.10.2 Yosemite myself.  Simple to fix.  First Close iCal.  Then go to system preferences and open internet accounts.  Selected the Exchange account and turn off calendar.  Closes System preferences.  Now, from the finder, goto the GO menu, and hold down the option key.  While holding down the option key, you will see "Library" appear.  Click on this and it will open a finder window.  Then go to directory named Calendars. You will see a file called, Calendar Cache.  It should be a big file, depending on how much you have stored on your ical, maybe around 5 to 11 megs.  Move it to the trash can.  Then restart iCal.  iCal will crash the first time you open it due to the missing cache file.  Just hit ok and reopen it.  At this point iCal will reload all you accounts.  This can take a couple of minutes depending on how much info is there.  Most of the time you Exchange account will reload by its self, but only after all the iCloud events are rebuilt.  After iCal is back up and running go back to System Preference and make sure Exchange calendar is on.  Most of the time it will turn on by it's self.  Best of luck.

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