I want to recommend SysBud MBOX to PST Converter that helps to convert MBOX file into Outlook PST file format at only $39. The software enables users to convert multiple MBOX files into single or separate PST files. It always keeps maintaining folder hierarchy, rich text formatting, email properties & Html formatting.
The free demo of this software is also available that helps to convert the first 20 emails from each folder at free of cost.

To download the free demo, visit here:-

https://download.cnet.com/SysBud-MBOX-to-PST-Converter/3000-2369_4-78053886.html