OK, then you try this method to open MBOX files in MS Outlook. Follow these steps:
- Open Outlook and then, click on File >> Open.
- Hit on Import to open Import and Export Wizard.
- Click on Import Internet Mail and Addresses >> Next.
- After that, choose Outlook Express 4.x, 5.x, 6.x or Window Mail.
- Import Mail option should be checked and then, click on Next.
- Now, a user can open MBOX file in MS Outlook 2016.