Error
Invalid non-recurring appointment start date.
Description
This error indicates that the calendar item is non-recurring and has an invalid start date.
Cause
This typically happens for old appointments that have become corrupted or were incorrectly created by a third-party application (such as a sync or CRM application).
Resolution
We recommend the following:
- Log the subject of failed items.
- Retry failed items (subjects will be logged).
- Review error logs to identify the offending calendar items.
- Fix the start/end date by opening and saving each calendar item.