Open Mbox files on Thunderbird without plugins (2025)
What you need
- Mbox files in a folder (.mbox, not zipped)
- Mozilla Thunderbird (free mail client)
- No plugins or add-ons needed!
How to do it (screenshots below the text)
- Hamburger menu (top-right) > new account > type: Feed
- Rename new account from “Blogs and News Feeds”
- Find the new account in the left bar. Right click. Go to “Settings”
- See the “Message storage” option; browse to the folder with .mbox files or multiple .mbox files or even sub-folders with .mbox files
- Restart Thunderbird as prompted
- Wait for Thunderbird to read the mail headers and display a count of message.
- Navigate as usual.
Screenshots of the process
