I have an Exchange calendar synced with Mavericks' Calendar app. I've changed time of one event. Since that a window with following message appears over and over:

Calendar can’t delete an occurrence from the repeating the event “[event]” from the Exchange server.

I've tried to re-add the calendar as well as the whole Exchange account. Deleting the Calendar Cache* files (in ~/Library/Calendars) screws up all calendar data and I'm not able to re-add the synced calendars.

I've all calendars synced in cloud (iCloud, Google, Exchange), so deleting the Calendar files is no issue.

  • It says it is a "Repeating" event !
    – Ruskes
    Aug 16, 2014 at 18:59
  • 1
    Yes, it is. Only one event of this series was changed. Does this matter?
    – vinca
    Aug 16, 2014 at 19:56

1 Answer 1


After trial and error, these actions finally solved this issue:

  1. Delete Exchange account from Internet Accounts in System Settings
  2. Clean User and System cache with Onyx
  3. Restart Computer
  4. Re-add the Exchange account

Tested on MacOS 10.9.4.

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