MBOX and PST both have separate data structure therefore user can't open MBOX file into Outlook directly. To make this conversion task easier for everyone, we suggest user to download MailsDaddy MBOX Converter tool. This single program is embedded with lots of advanced features to migrate data from MBOX to PST format. The program has multiple conversion options like Office 365, EML, MSG, HTML etc. The application is compatible with all Windows OS and easily migrate MBOX to PST.

Read more: https://www.mailsdaddy.com/mbox-to-pst-converter/

Manual: https://www.mailsdaddy.com/blogs/import-mbox-outlook-full-accuracy/