To export or convert MBOX files into PST format to import in Outlook you need a professional software solution like Shoviv MBOX to PST Converter tool that comes with a free trial version.

Key Features of this tool:

1. Multiple MBOX File Conversion

2. Preview before performing actual MBOX file conversion.

3. Convert MBOX to various formats.

4. Export MBOX to cloud Office 365.

5. Incremental export option present.

6. Fast conversion and Migration.

Read more: https://www.shoviv.com/how-to/export-mbox-to-pst-manually.php