As everyone here uses Thunderbird you are very unlikely to get much if anything in the way of a recommendation. You would be better served on an outlook forum where folk that have done it might be found.

You can read this thread, Available solution for converting MBOX to PST. https://support.mozilla.org/en-US/questions/1162622

I vote for this as Best MBOX to PST Converter, after a long period search on Google I found this MBOX to PST Converter Software is effective and this tool is able to Migrate MBOX files, it be successful in conversion easily, I would like to make a rating of 4.9/5. I was really amused with its working. Thank You developers. http://www.demoware.org/data-migration/mbox-to-outlook.html

Apart from using Third Party tool, you can also convert MBOX to PST by using the manual method.

You can check this article from here: http://it.toolbox.com/blogs/recover-outlook/manual-method-to-export-thunderbird-data-mbox-into-outlook-pst-70196