outlook classic deleted emails

Outlook Classic deleted emails reappearing is a known issue on Windows 11 with Microsoft 365. Users report that after deleting emails, they return upon restarting Outlook or the PC. This problem often coincides with Outlook failing to open on subsequent launches, requiring a restart or Task Manager intervention. OneDrive personal may show a file-in-use error, suggesting a sync conflict. Troubleshooting steps include checking Outlook add-ins, repairing the data file, or disabling OneDrive integration. The tag covers recurring deleted emails and related Outlook Classic startup failures.