You can easily convert your MBOX files through a Free MBOX to PST Converter
tool. It can easily Import MBOX to Outlook, including email, contacts, calendars, tasks, notes, etc. It is compatible with all windows and gives an option to export Mbox files to PST, OST, PDF, DOCX, HTML, etc.
Handles corruption in MBOX and MBX files.
Provides the option to remove duplicate emails.
Allows previewing the data before conversion.