KCS - Outlook Desktop Sync Error Code 403 because Clio's Office 365 sync is being used


  • Error code in Outlook Desktop Sync, encountered when attempting to run the sync


  • Clio Web App
  • Outlook Desktop Application

Additional Information:

Full Error:

"The system has detected that your Clio calendar has an active Office 365 sync. Outlook Desktop sync is disabled to prevent duplicate events from being created"


A User on the Clio Account is using the Office 365 Calendar Sync.


Contact Clio's Support team for help with addressing this error

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