You want to convert MBOX files to PST files. I suggest the ToolsBaer MBOX to PST Converter Tool. This application is compatible with all versions of Microsoft Outlook such as 2000, 2003, 2010, 2013, and 2021. It is lightweight application so users easily install this tool. The extensive capabilities of this application cater to a wide range of client requirements and provide a superb data conversion experience. It works with email clients such as Windows Live Mail, Thunderbird, Mac Mail, Eudora, SeaMonkey, and others. MBOX files have a large number of emails and attachments, whereas Outlook PST files have a large number of emails, contacts, notes, messages, calendars, and other properties.

Thanks for information