MBOX file is an incompatible file format for Microsoft Outlook, so here users need a solution to convert data to PST file format. Manual and third-party tools are the main process to migrate database from MBOX files to Outlook and others.
If you have used the manual method but did not get the desired output, use
MailsDaddy MBOX Converter tool. This GUI solution has many features to open mailboxes in MS Outlook. The software manages the internal and external folder structure during migration. You can also start the conversion with the free demo version and transfer a few emails from each folder.