Use eSoftTools Outlook PST to MBOX Converter Software to convert Outlook emails to MBOX. During the conversion of PST to MBOX files, this application is kept with email properties. All customers have access to a product demo version. All customers have access to the demo version. The demo version allows you to convert 25 emails per folder.
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Install Mozilla Thunderbird if you don't have it already.
In Outlook, export the desired emails or folders to a format like EML.
Open Thunderbird and navigate to "Tools" > "Import".
Choose "Mail" and then "File".
Select the exported EML files and click "Open" to import them.
Right-click the imported folder and choose "Export" > "Email Messages".
Select "MBOX Files (*.eml)" as the file format and specify the output location.
Start the export process to convert the EML files to MBOX format.