How to fix Outlook error 0x80040900 − Windows 8.1, Windows 10 (Nothing else worked)
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Solutions (1)
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Reinstall Outlook
0(0)0(0)If none of the other solutions worked, reinstalling Outlook is the only last-resort option. By reinstalling Outlook, you will remove all the core corrupt files and restore Outlook to its default settings. Then you would just configure Outlook again, following the instructions of your email provider.
Feel free to check the don't know how to uninstall a program / an application guide, on how to uninstall programs properly.
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