If you want to View MBOX Files without installing any email client, the process is actually quite simple. Instead of depending on apps like Thunderbird or Apple Mail, you can use a dedicated tool such as SysInfo MBOX Viewer. I once had a folder full of old MBOX files but didn’t want to set up a full email client just to check them. Using this kind of viewer, I simply opened the software, added my MBOX files, and instantly saw all emails, including attachments, neatly organized. It even showed folders like Inbox and Drafts just like an email app would. The best part is that it works independently, so you don’t need any technical setup—just load the file and start reading.
Read More: https://www.sysinfotools.com/freeware/mbox-viewer.php