Convert PST to Thunderbird on any platform
Thunderbird is one of the most popular open-source email clients, available on Mac, Windows and Linux. If you have Outlook PST files you want to access in Thunderbird, this converter processes them locally on your machine — no internet connection required, and your email data stays completely private.
How to convert PST to Thunderbird
1
Download PST to Thunderbird
Click the download button below that matches your computer's operating system. If on Linux, once downloaded, find the program file in your Downloads folder and make it executable.
2
Select your PST file
Open the converter and select the PST file you want to migrate. The tool works with PST files from any version of Outlook, whether created on Windows or Mac.
3
Press the Preview Contents button
This will allow you to see the contents of the PST file. This also confirms that the PST file is not corrupt and conversion to Thunderbird can proceed.
4
Choose the Destination Folder
The converter will automatically find where Thunderbird is installed and where it looks for local folders. You have the option to choose a different folder should you wish.
5
Run the offline conversion
The converter processes the PST archive entirely on your own machine, extracting emails, folder structure, and attachments into a format Thunderbird expects. Before starting the conversion, it is recommended that you close all instances of Thunderbird.
6
Start Thunderbird
The newly imported folders and messages will appear under Local Folders.
Works on Mac, Windows and Linux
Unlike many PST tools that are Windows-only, the PST to Thunderbird Converter runs natively on all three major platforms. Whether you are migrating on a Mac, a Windows PC, or a Linux machine, the process is the same.
What gets preserved
📧
All emails
Every message in your PST archive is converted, including HTML-formatted emails.
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Folder structure
Your original Outlook folder hierarchy is preserved exactly in Thunderbird.
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Attachments
All file attachments are carried through the conversion and remain accessible in Thunderbird.
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Dates & headers
Original sent and received dates, as well as email headers, are preserved.
Do I need Outlook installed?
No. The converter reads PST files directly — it does not use or require Outlook. This makes it ideal for users who have switched platforms and no longer have access to Outlook, or who simply want to avoid installing it.
Online converters vs offline
Online PST converters require uploading your entire email archive to a third-party server. Email archives frequently contain sensitive personal, financial, and professional information. An offline converter keeps all processing on your own machine — your data never leaves your control.
Pricing
The PST to Thunderbird Converter is completely free — no licence key required, no subscriptions, no charges of any kind. Download and use it without restriction.
Frequently Asked Questions
Can I convert PST to Thunderbird without Outlook?
Yes. The converter reads PST files directly without Outlook being installed on your machine.
Does the PST to Thunderbird converter work on Windows?
Yes. The converter runs on Mac, Windows and Linux.
Will my folder structure be preserved when converting PST to Thunderbird?
Yes. The converter preserves your original Outlook folder hierarchy, emails, and attachments.
How much does the PST to Thunderbird converter cost?
The tool is completely free — no licence key required.
Platform-specific guides