How to Export MBOX from Thunderbird – Free Vs Tool
Written by Shaks George, Senior Analyst at Corbett Software. Shaks works on email client migration and mailbox data recovery cases.
Need your Thunderbird mail as MBOX files to move, back up or import elsewhere? Here is the good news most guides bury. Thunderbird already keeps your mail in MBOX format, so getting it out is easier and more free than you have probably been told. Two no cost routes come first, then the bulk option.
Summary: To export MBOX from Thunderbird, use the free ImportExportTools NG add on to export any folder to an MBOX file, or copy the MBOX file straight out of your Thunderbird profile folder. For many folders or a whole account at once, the Corbett Thunderbird Tool exports every folder to MBOX in one run.
Why Export MBOX from Thunderbird?
The usual goal is portability. MBOX is a widely supported format, so an exported file can be imported into Apple Mail, another Thunderbird install or read by conversion tools, which makes it the natural choice when you are switching machines or clients. People also export MBOX as a plain backup, a copy of the mailbox kept safe outside the program in case of accidental deletion, and to archive old folders offline where they can be opened later without running Thunderbird at all.
The Useful Fact: Thunderbird Already Uses MBOX
This is the detail that makes the whole task simpler than it sounds. Thunderbird does not store your mail in some private format that needs converting. It stores each mail folder as an MBOX file already, sitting in your profile folder on the disk. Your Inbox is one MBOX file, Sent is another, and so on, in the Mail and ImapMail directories under your profile.
So exporting MBOX from Thunderbird is really just a matter of getting those existing files out cleanly, either through the add on that does it tidily or by copying the file itself. There is no format conversion happening, which is why the free routes below work so well.
Free Method 1: Export a Folder with ImportExportTools NG
The free ImportExportTools NG add on is the clean way to export a folder, because it names the file properly and lets you pick the destination.
- In Thunderbird, click the menu button, choose Add ons and Themes and install ImportExportTools NG from the official Thunderbird add ons site.
- Restart Thunderbird if it asks, then right click the folder you want to export.
- Choose ImportExportTools NG, then Export folder to save the whole folder as an MBOX file.
- Pick a destination and the folder is written out as a single .mbox file.
This is the route to use when you want one or two folders exported neatly with the right file name.
Free Method 2: Copy the MBOX File from the Profile
Because the folders are already MBOX files, you can also just copy them out directly, no add on needed.
- Close Thunderbird so the files are not in use.
- Press the Windows key plus R, type %appdata%\Thunderbird\Profiles and press Enter.
- Open your profile folder, then the Mail or ImapMail folder, and find the file named after your folder, such as Inbox, with no file extension.
- Copy that file wherever you want and add a .mbox extension if your destination program expects one.
This is the fastest route when you know exactly which folder you want and do not mind hunting it down in the profile.
Where the Free Routes Get Tedious
Both free methods are happiest one folder at a time. Export a single Inbox and either is quick. But a real account with dozens of folders means repeating the add on export for each one, or digging through the profile and matching cryptic file names by hand, where a wrong guess copies the wrong folder. The profile copy route also leaves you with files that have no extension and odd companion files, which you then have to tidy up. For one or two folders the free way is genuinely fine. For a whole mailbox exported in one clean pass, it becomes a chore.
Bulk Method: Export Every Folder at Once
The Corbett Thunderbird Tool auto detects your Thunderbird profile and exports the whole account to MBOX in a single run, every folder named correctly and the structure preserved, with no profile digging. It previews the mail first, lets you filter by date or sender so you can export only what you need, and can also save to other formats like PDF or EML if your plans change. A free demo edition lets you evaluate it, and it runs on all editions of Windows.
Steps to Export MBOX from Thunderbird
- Install and launch the tool, then click Open, choose Desktop Email Clients and select Thunderbird.
Step 1: Choosing Thunderbird as the source.
- Let the tool detect the profile and load the mailbox, then preview your folders.
Step 2: The Thunderbird mailbox in the preview panel.
- Click Export and select MBOX from the format list.
Step 3: The Export list with MBOX selected.
- Apply any date or sender filters, browse to a destination and click Save to run the export.
The export copies your mail, so the Thunderbird profile stays exactly as it was.
Free Methods vs the Tool
| Free Methods | Corbett Thunderbird Tool | |
|---|---|---|
| Scope per run | One folder at a time | Every folder in one pass |
| File naming | Manual, or cryptic in the profile | Named and structured automatically |
| Filtering | None | By date or sender |
| Cost | Free | Free demo, paid license for full use |
Read Similar Blogs:
People Also Ask
A1: Yes. Thunderbird saves each mail folder as an MBOX file in your profile folder, under the Mail or ImapMail directory. That is why exporting to MBOX needs no conversion, the files are already in that format.
Q2: How do I export MBOX from Thunderbird for free?
A2: Install the free ImportExportTools NG add on, right click the folder and choose Export folder to save it as an MBOX file. You can also close Thunderbird and copy the folder file straight out of the profile.
Q3: Where is the Thunderbird MBOX file located?
A3: Under %appdata%\Thunderbird\Profiles, inside your profile in the Mail or ImapMail folder. Each file is named after the folder, such as Inbox or Sent, usually with no file extension.
Q4: Can I export all Thunderbird folders to MBOX at once?
A4: Not in one click with the free methods, which work folder by folder. A Thunderbird export tool reads the whole profile and exports every folder to MBOX together, named and structured automatically.
Q5: Will exporting change my Thunderbird mailbox?
A5: No. Every method here copies the mail out and leaves the originals in place. Your Thunderbird profile stays exactly as it was.
Conclusion
Exporting MBOX from Thunderbird is simpler than the old advice makes it sound, because the mail is already in MBOX format to begin with. For a folder or two, the free ImportExportTools NG add on or a straight copy from the profile gets you there at no cost. For a whole account exported cleanly in one pass, the Corbett Thunderbird Tool handles every folder without the profile digging. Pick the route that fits how much you are moving. Is it a folder or two, or the entire mailbox?
