PST to MBOX converter — migrate Outlook archives anywhere
Drop a .pst file and export it as a standard .mbox mailbox — every message, attachments embedded — ready to import into Thunderbird, Apple Mail, or any mbox-aware client. The conversion runs locally; your mail never leaves your device.
Drag & drop your .pst / .ost file here
it is parsed in this tab — never uploaded
Your files never leave your device — everything is parsed locally in your browser.
Mailbox
License active ✓ Keep this key to yourself — abnormal usage will get it deactivated.Select a message to read it here.
- From
- To
- Cc
- Date
This message stores its body as RTF only — shown as plain text, so formatting is degraded.
How it works
Drop your .pst file
Parsed locally in the tab — no upload. The folder tree confirms the archive is complete before you convert.
Export as MBOX
Choose "MBOX mailbox" in the export row. Each message becomes a standard RFC 822 entry with its attachments embedded as MIME parts, in folder order. The free tier covers the first 10 messages.
Import into your mail client
Thunderbird: install the ImportExportTools NG add-on → right-click a folder → Import mbox file. Apple Mail: File → Import Mailboxes → "Files in mbox format". Your archive is now local mail again.
Simple pricing
The viewer and 10-message exports are free. A one-time license unlocks unlimited exports.
Free
$0
- Browse every folder, read every message — unlimited
- Single attachments download free
- Export the first 10 messages as EML zip, MBOX, PDF or CSV — unlimited times
- No account, no upload, no watermark
3-month license
$14.99 one-time · 90 days
- Unlimited exports — every message, every format
- Bulk attachment extraction (.zip)
- Cross-folder search
- 90 days from purchase, never auto-renews
By purchasing you agree to the Terms of Service and Privacy Policy. Full refund within 14 days if it can't handle your file.
Lifetime license
$29.99 one-time · forever
- Unlimited exports — every message, every format
- Bulk attachment extraction (.zip)
- Cross-folder search
- Pay once, use forever — no subscription
- Support a small independent tool
By purchasing you agree to the Terms of Service and Privacy Policy. Full refund within 14 days if it can't handle your file.
Frequently asked questions
How do I convert PST to MBOX?
Drop the .pst file into the box above, select "MBOX mailbox" in the export row, and click "Export all". The .mbox downloads straight from your browser — no server, no Outlook needed.
How do I import the .mbox into Thunderbird?
Install the free ImportExportTools NG add-on, right-click the destination folder (or Local Folders), choose ImportExportTools NG → "Import mbox file", and pick the downloaded file. Every message lands with its original date, sender, subject and attachments.
Does it work with Apple Mail?
Yes — Apple Mail imports .mbox natively: File → Import Mailboxes → "Files in mbox format". That is the standard route for moving an old Outlook archive onto a Mac.
Are attachments kept?
Yes — attachments are embedded in each message as standard MIME parts, exactly as they were stored in the PST. They come through the import like ordinary mail attachments.
What's free and what does a license unlock?
Free: the first 10 messages exported to MBOX (or EML zip, PDF, CSV), unlimited times — enough to verify the conversion on your real file before paying. A one-time license (3-month $14.99 or lifetime $29.99) exports the whole mailbox and adds bulk attachment extraction and cross-folder search.
Does the file leave my computer?
No. Parsing and conversion run in JavaScript inside your browser tab; nothing is uploaded. Check the Network tab in developer tools — the only requests are page loads, an anonymous usage counter, and license validation for paid users.