If you're looking for the best MBOX converter application, just use the best SysInspire MBOX to PST Converter Tool, which is the most appreciated Tool in the web market and provides wonderful workspaces for customers to integrate MBOX into Outlook 365. This product can convert individual or many MBOX mailboxes and works with all versions of MS Outlook 2019, 2016, 2013, 2010, 2007, and 2003. It can also convert Thunderbird MBOX to PST, EML, EMLX, MSG, YAHOO, OFFICE 365, GMAIL, and HTML files.
Read More:- Convert MBOX to PST
Run Apple mail in your system.
Go to File >> Import mailbox option.
Now select the source of the MBOX file and click continue.
On browse location, choose MBOX file then click continue.
After the import process complete, click done.