You can try this MBOX file to PST file Converter tool. This software provides two options for saving the converted files i.e. the user can either save the converted files in already existing PST or in a newly created PST. This Software allows users to preview converted items before you import into Outlook. This Software Allows user to Convert MBOX file to PST, EML, MSG, EMLX, HTML and Office 365 Platform.
Try this Software free trial version from here: MBOX file to PST file Converter