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Fix 'Outlook Data File Cannot Be Accessed' Error in Outlook 365 - How to Fix Windows Defender Error 0x800704ec After Update-Troubleshooting Windows Defender Security Center Won't Open

Updated 2026-06-13 13:04:46browser-issues
Fix 'Outlook Data File Cannot Be Accessed' Error in Outlook 365 - How to Fix Windows Defender Error 0x800704ec After Update-Troubleshooting Windows Defender Security Center Won't Open
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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