I think third party software is perfect for MBOX to PST conversion. You can easily convert MBOX files to Outlook PST file format without losing MBOX file data. So, I recommend MBOX to PST converter Software, working with the software is very easy because the utility provides perfect user-intuitive design and also provides many other features such as convert all MBOX items from MBOX folder, support different mail client, etc. MBOX to PST converter is a useful tool without the need of MS Outlook installation user easily convert MBOX file data to PST format.
https://gallery.technet.microsoft.com/Easy-MBOX-to-PST-b74e6236?redir=0