How to fix Outlook won't open 'set of folder cannot be opened' …
https://pureinfotech.com/fix-outlook-wont-open-set-folder-cannot-opened-error-windows-11-10/
WebNov 8, 2023 · Fix error preventing Outlook app from opening. To fix the error “set of folder cannot be opened,” close Outlook 2021, 2016, or 2016, and use these steps: Open Start on Windows 11 (or 10). Search for regedit and click the top result to open the Registry. Navigate to the following path:
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