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I strongly recommend utilising the eSoftTools MBOX Converter application to migrate MBOX to Office 365. It is one of the most powerful programmes for converting MBOX files to PST files, both single and many. It can automatically recognise Thunderbird MBOX file sections for exporting to PST files without causing any data loss. This app has been thoroughly checked by web scanners and antiviruses.

Read more:-  Migrate MBOX to Office 365