Convert MBOX file to PST format using manual methods is not so easy. It is a lengthy process and took a lot of time. To do this conversion, I would recommend MBOX to PST Converter. It quickly converts MBOX file data to PST format. It supports all major MBOX clients like thunderbird, Apple Mail, Eudora, Gmail, Entourage, Netscape, etc. For more info: https://www.mailsclick.com/convert-mbox-file/