Fix Outlook 'Permission Denied' Error When Opening Attachments - Slow OneDrive Uploads: Troubleshooting Steps-Microsoft Store File Locked: Troubleshooting Guide

Updated 2026-06-14 13:27:19backup-recovery
Fix Outlook 'Permission Denied' Error When Opening Attachments - Slow OneDrive Uploads: Troubleshooting Steps-Microsoft Store File Locked: Troubleshooting Guide
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.