Convert PST to MBOX — in your browser
Move an Outlook .pst archive into the .mbox format that Thunderbird, Apple Mail, and Gmail import understand. The conversion runs on your machine — your mail is never uploaded.
Drop the .pst file — Mailward lists every folder without Outlook.
Convert one folder free, or select the whole archive with a license.
Download the .mbox file, generated entirely in your browser.
Import it into Thunderbird, Apple Mail, or a Gmail migration.
Convert PST to MBOX — in your browser
Use this converter to free an Outlook archive from PST so it can move into Thunderbird, Apple Mail, or a Gmail migration. Mailward reads the PST in your browser and writes standard MBOX — one mailbox file per folder, or a combined export with a license.
Converting a single folder is free; whole-archive and multi-file batches are the paid step. The archive never touches a server, which matters most for the client, HR, and legal mail people actually convert.
On a Mac? macOS has no readpst and new Outlook for Mac won't export mail files. A browser tool is the one path that doesn't need a Windows machine.
Converting this file
Q. Which apps open an MBOX file?
Thunderbird (via ImportExportTools NG), Apple Mail (File → Import Mailboxes), and most Gmail or Google Workspace migration tools read MBOX directly.
Q. Is converting free?
Converting a single folder is free. Exporting the whole archive, or several PSTs at once, into combined MBOX files is part of the one-time Pro license.
Q. Does my mail get uploaded?
No. The PST is read with the File API and converted in a Web Worker on your device. You can disconnect from the network after the page loads and the conversion still works.
Q. Will a multi-GB PST convert?
Yes. Mailward streams the file in pages rather than loading it whole, so large archives convert without running the browser out of memory.
Simple, one-time pricing
Opening, reading, searching, and single-message export are free forever. Batch conversion is a one-time unlock — no subscription, no recurring fees.
Everything you need to open and read an archive.
- Open & read PST, OST, MBOX, EML — locally
- Full-text search across every folder
- Export a single message
- Files never leave your device
Unlock batch conversion for good — a single payment, yours to keep.
- Batch-convert whole folders to MBOX or EML
- Export all search results as .eml files in one click
- Extract every attachment to a ZIP
- Lifetime license — no renewals
Other formats & archives
Same local-first engine, every common mail format.