Outlook on Mac: Move email messages between different accounts
I haven't been able to try moving with drag &amp; drop but exporting and importing works well.
Exporting : https://support.microsoft.com/en-us/office/export-items-to-an-archive-file-in-outlook-for-mac-281a62bf-cc42-46b1-9ad5-6bda80ca3106
Importing : https://support.microsoft.com/en-us/office/import-email-messages-contacts-and-other-items-into-outlook-for-mac-6cc48404-a65c-4b8c-a12a-95a905249414