If you face difficulties to open MBOX files, I would like to suggest MacSonik MBOX Viewer, which is designed with multiple advanced features. The advanced utility provides easy access to and viewing of MBOX files, which means it allows you to open, view, and print your MBOX files without any disturbance. Additionally, you can preview MBOX, MBS, MBX, or any other MBOX files along with their attachments, regardless of which email client created them. This advanced utility is suitable for all versions of Mac and Windows devices, providing a smooth experience across platforms.
Also Read: https://www.macsonik.com/mbox-viewer/