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Fix Outlook Data File Access Denied Error on Windows 10 - Windows Defender Threat Service Stopped: Step-by-Step Checklist-How to Make a New Firefox Profile When the Old One Vanishes

Updated 2026-06-13 12:13:29browser-issues
Fix Outlook Data File Access Denied Error on Windows 10 - Windows Defender Threat Service Stopped: Step-by-Step Checklist-How to Make a New Firefox Profile When the Old One Vanishes
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.

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