PST to MBOX converter: Outlook to Thunderbird, Apple Mail

PST

Drop the PST to convert

or choose it (OST files too). You get a ZIP with one .mbox per folder.

Read on this computerNothing uploaded

The result is checked before you can save it.

Working

Elapsed 0 s · your file stays on this computer

That didn't work

Run a health check

How it works

3 steps, nothing to install.

Check the PST

A free health check confirms the file is readable and counts its messages.

Convert

Each folder becomes an .mbox file in a ZIP, with attachments and HTML kept.

Import

Thunderbird: ImportExportTools NG › Import mbox file. Apple Mail: File › Import Mailboxes › Files in mbox format.

Verified, not assumed

Checked before you save it.

The engine checks its own work. The result is read back from storage and compared with your original, and the report you can download lists every check.

Every message parsed back from the archive and compared with the PST

Subject, addresses, bodies, attachments, date and Message-ID kept

Archive checked entry by entry

The original file is unchanged

FAQ

Questions, answered.

What is in the ZIP?

One .mbox file per folder, in your folder structure, plus nothing else. Unzip it before importing.

What is not converted?

Contacts, calendar items and tasks become plain messages; embedded messages and links to files are listed in the report but not converted yet.

Is my file uploaded?

No. The engine runs inside your browser tab and reads the file from your disk. Results are written to your browser's private storage until you save them. Nothing is sent to a server.

Convert PST to MBOX.

Drop the PST to convert

That didn't work

3 steps, nothing to install.

Check the PST

Convert

Import

Checked before you save it.

Questions, answered.

More PST tools.

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PST Viewer

Repair PST