There are many manual methods available for accessing the MBOX files but manual methods have many limitations, then I found out about the MacSonik MBOX Viewer. The software has advanced features like 20+ MBOX-Supported Emails Clients in which the tool can extract and display data from various email clients that support MBOX. Apart from this, the software is compatible with over 20+ MBOX supported email services like Apple Mail, Mozilla Thunderbird, Spicebird, Netscape, Entourage, IncrediMail, Google Takeout, Postbox, Mulberry, Opera Mail, and many more.

For more visit here : https://www.macsonik.com/mbox-viewer/