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How to Fix 'Outlook Data File Cannot Be Opened' Error - Fix OneDrive Sync Error 0x80070020: File Locked-Troubleshooting Teams Proxy Refused Error

2026-06-13 22:09:32developer-tools
How to Fix 'Outlook Data File Cannot Be Opened' Error - Fix OneDrive Sync Error 0x80070020: File Locked-Troubleshooting Teams Proxy Refused Error

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.