How do I open MSG files in MBOX format?

If you are looking to open MSG files in MBOX format, you first need to convert MSG to MBOX format, which is supported by email clients like Mozilla Thunderbird. Since Outlook does not natively export MSG to MBOX, using a reliable third-party tool such as the Aryson MSG Converter is an effective solution.

Download and install the software, then launch it on your Windows, Mac, or Linux system. Click on “Select File” or “Select Folder” to add MSG files. Preview the emails and choose MBOX as the output format. Set the destination path and apply any optional filters like date range or duplicate removal. Finally, click “Convert” to start the process.