It might be difficult to manually access and convert MBOX files since they are not readily available but MacSonik MBOX Viewer can make it easy without any trouble. It offers multiple advanced features like Specific Email Conversion in which you can select your desired time or select the dates in a specific range from start date to end date for conversion. Additionally, the software allows you to view and convert MBOX files into various formats like PST, EML, EMLX, PDF, MSG, CSV, DOC, HTML, and other formats.

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