I suggest you use a known tool that instantly Convert MBOX to PST file format using the excellent eSoftTools MBOX to PST Convertersoftware. MBOX to PST Converter tool is one of the successful and reliable tool that support the conversion of several Email Clients such as Apple Mail, Thunderbird, Entourage, Pocomail &, etc. They have updated the particular conversion feature used to export details and folders from MBOX to Outlook Files. A free trial pack is available for this software. You can download this tool from its official websites.