If you are looking for best method to convert MBOX files to PST format then you may try professional MBOX to PST Converter that directly convert MBOX files to Outlook PST format with an attachments, contacts, notes, journals, etc. This utitlity is very easy to use and show live preview of selected MBOX files which you want to convert into PST format. The software kept intact meta properties of MBOX emails and preserves folder or subfolders of MBOX files during the whole process of conversion from MBOX to PST. It is fully supportable to all daily used MBOX based emails clients and viable to Microsoft Outlook 2019, 2016, 2013, 2010, 20007, etc. Users can download free demo version of this well developed tool to convert up to 25 MBOX emails for free.
for more info: https://www.emailsguru.com/mbox/pst/