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Salesforce for Outlook Sync Errors and Explanations

게시 일자: Jun 2, 2026
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Salesforce for Outlook (SFO) sync error messages have changed over time. This article lists known sync error messages — including legacy error messages that have been updated — along with explanations of the errors that are not self-explanatory. Use this reference when troubleshooting Salesforce for Outlook sync issues related to events, tasks, and recurring series.
Note: Salesforce for Outlook is a retired product. See Salesforce for Outlook Retirement for migration guidance.

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Legacy Error Message

Current Error Message

Explanation

An event can't last longer than 14 days.You can't create an Outlook event which spans more than 14 days, and sync​ it. That is an Outlook system limitation. 
Based on the frequency you selected, the end date cannot be after MM/DD/YYYY.: End Date There is a maximum end date for any recurring event series in Salesforce. This error message is displayed if you exceed the max end date.
Single events cannot have detail commands.This event can't sync because it was converted into a recurring series in Outlook. To sync the series, delete and replace the event with a new recurring series in Outlook.Please refer to Salesforce For Outlook - Sync Error "This event can't sync because it was converted into a recurring series in Outlook" for more information.
The end date of a recurring series cannot be set to a date in the past.: End Date This error will happen when you have a recurring series in Outlook which is already synced to Salesforce and the end date of the series in Outlook is modified such that it is in the past. This change is allowed in Outlook but not in Salesforce.
The field RecurrenceStartDateTime is invalidThis recurring series can't sync because it was converted into a non-recurring event in Outlook. To sync the event, delete and replace the recurring series with a new non-recurring event in Outlook. 
You cannot modify the start date of a recurrence series that has already started: Start Date. This error will happen when you have a recurring series in Outlook which is already synced to Salesforce and change the start date after the series has started. This change is allowed in Outlook but not in Salesforce. Please see Start dates for recurring series in Outlook for further explanation.
Unable to sync. Review the appropriate log for details.
A sync error occurred. Review the appropriate log for details.		The Outlook event can't find the Salesforce event that it was syncing with. Delete and recreate the event to continue syncing it. 
Unable to sync. Review the appropriate log for details.
Nullable object must have a value.		This event can't sync because it was converted into a recurring series in Outlook. To sync the series, delete and replace the event with a new recurring series in Outlook. 
Tasks between Salesforce and Outlook include matching subjects and due dates. To sync tasks successfully, verify that the following records include subjects and due dates that are unique between Salesforce and Outlook. Salesforce ID: 18-digit. This happens when one Salesforce record matches multiple records in Outlook. The user would need to change the subject and due date in either Salesforce or Outlook to something unique and then sync again. It would be best to change in Salesforce as there would only be one record there.
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