How to Import MBOX Files
MBOX Import Tool is a Windows and Mac OS application that allows you to import MBOX files straight into Thunderbird, Outlook and Hotmail accounts. Import MBOX file mailbox data to PST, EML, MSG, MHT, PDF, and other file formats and export the data to email clients including Gmail, Yahoo, Thunderbird, Outlook, Zimbra and IMAP.
Visit: https://www.msoutlookhelp.com/import-mbox/

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Ashika Sharma commented
To import MBOX files to the desired format, you can go with the MacSonik MBOX converter tool. This software supports all MBOX files and converts them to 20+file formats and email clients in bulk. The Date Range Filter option allows users to select the desired dates for the conversion of emails. The MBOX converter has a custom folder name option to set the desired name of the resultant file.
Follow the below steps to easily import MBOX files to desired format -
1. Install and run the MBOX converter.
2. Select the desired MBOX file(s) that you want to import.
3 Choose the format in which you want to convert the MBOX file.
4. Set the desired name for the resultant file.
5. Click convert to initiate the process. -
Somit Vishwakarma commented
MailsDaddy MBOX to pst converter tool does not require installing MS Outlook or any other program to perform conversion from MBOX to pst and others. You can convert up to 20 emails from each mailbox using the free version to test the efficiency of the software. For any information related to the solution, please visit the official website of MailsDaddy.
Read more: https://www.haikudeck.com/p/4a095ae174/mbox-to-pst-converter
Read more: https://www.mailsdaddy.com/blogs/import-mbox-outlook-full-accuracy/