Invalid non-recurring appointment start date

​Invalid non-recurring appointment start date: This error indicates that the calendar item is non-recurring and has an invalid start date. This typically happens for old appointments which have become corrupted, or for appointments which were incorrectly created by a third-party application (such as a sync or CRM application).


We recommend the following:

  1. Log the subject of failed items..
  2. Retry failed items (subjects will be logged)
  3. Review error logs to identify the offending calendar items.
  4. Fix the start/end date (i.e., open and save each calendar item).
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