If you're looking for software to convert Thunderbird MBOX files to PST files, I recommend eSoftTools Thunderbird MBOX to Outlook Converter. This software can convert single or multiple MBOX files to Outlook in a matter of seconds. It can convert Thunderbird MBOX files of any size into the specified formats. It can convert Thunderbird MBOX to PST files, including folders and subfolders.
Read More:- Convert Thunderbird MBOX files to PST files
Convert MBOX to PST Using Email Clients
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.
Hope this helps,
Jimmy Wick