A well-programmed solution is only the way to open MBOX file with a few clicks. Because email client installation and configuration takes lots of time and disappoints you too.
Lots of freeware MBOX viewer tools are available in the online market. But for reliable view and accuracy, try the MailsDaddy Free MBOX viewer tool. This single application is enough to open MBOX data files over 25+ email client MBOX files.
The software is built on a simple GUI interface, so even a non-technical user can use the software and read MBOX data without any hassle.
When a user upgrades the tool to the Pro version it offers more benefits like export mailboxes, bulk migration, email filters, etc.