The MBOX file is used in many email clients such as Gmail, Webmail, Thunderbird, Postbox, etc., but is not supported by Microsoft Outlook. So we suggest MailsDaddy
MBOX to PST converter tool to open MBOX file in Outlook 2019, 2016, 2013 and other earlier versions. The software has many features that the user can use during the conversion and can convert data from MBOX to many email clients like PST, Office 375, EML etc. The software is compatible with all Windows OS, so there is no error in installing and running it. Its free version allows the user to convert up to 20 emails from each mailbox.