Hi bartoszbp, Try to update Outlook to make sure the client is in the latest version. Use Outlook search feature and Spotlight to check if the missing emails can still be found. You may use the OutlookResetPreferences tool in this to check if issue persists ( Please kindly be noted that this tool will reset all Outlook Preferences back to defaults). Meanwhile, to better help you, please contact our dedicated support team via Outlook-Help-Contact Support to obtain expert assistance.
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Regards, Anna.