How to Import OST to Thunderbird in 2024?

Jackson Strong | May 28th, 2024 | Email Migration

Summary: This informative article explains how to import OST to Thunderbird. As this query is frequently searched by most of the users. Thus, we decided to prepare this blog to solve this problem. However, you can’t just open any random OST file in Thunderbird. To make this happen, read this blog till the end to learn about the useful solutions in more detail.

Before moving to the solutions, it is essential to understand the need to import OST file to Thunderbird client.

Why Choose Thunderbird?

There are several reasons you might want to transfer emails from OST to Thunderbird:

  • Thunderbird is free and open-source that is easily accessible to anyone.
  • Thunderbird is a cross-platform workable on all Windows, macOS, and Linux OS.
  • With Thunderbird, you can configure any webmail account.
  • Also, it will let you export Thunderbird data into multiple file formats.

Can Thunderbird import OST files? No, it is impossible to migrate data from OST file to Thunderbird. OST is an Outlook offline storage data file that is not supported by Thunderbird.

However, we have a two-step process for you: first, convert OST to PST and then import PST into Thunderbird through Outlook. But there is a limitation of this method: you need to have an active Outlook profile with OST file, that must be configured it. Also, you can use automated software to import OST to Thunderbird easily.

Let’s get into this method to learn all these methods in more detail.

How to Import OST File to Thunderbird Free?

You can use the Import/Export Wizard in Outlook to import OST file including all your data.

  1. Open MS Outlook on your computer.
  2. Go to File > Open & Export > Import/Export.
  3. Select Import from another program and click Next.
  4. Choose Import from Outlook data file (.pst) and click Next.
  5. Click the Browse button to find your file, then click Finish to start.
  6. Set Outlook as your default email program.
  7. Next, Run Thunderbird; go to the menu options, and click on Tools.
  8. Select Import and choose Import from Outlook, then click Continue.
  9. Choose what to import from Outlook and click Continue.
  10. Finally, click on Import.

Please Wait! The process may take several minutes to complete.

  1. This method only works with an active Outlook profile and a healthy OST file.
  2. Only one OST file can be imported at a time.

If these criteria aren’t fulfilled, choose the below solution to complete your task without an issue.

How to Convert Outlook OST to Thunderbird Automatically?

Advik OST Converter enables you to import OST file to Thunderbird with attachments. With its dual-mode feature, you can even upload multiple OST files at the same time. The software will preserve email attributes like cc, bcc, date, time, signature, etc. OST to Thunderbird Converter will maintain folder hierarchy as well.

Click on the FREE download button to check its steps to import 25 emails from each OST folder at no cost.

Download the software and try it for FREE.


Note: Thunderbird installation is required.

Steps to Import OST to Thunderbird

Step 1. Run OST to Thunderbird Tool on your PC.

Run OST to Thunderbird Tool

Step 2. Click Select Files and Select Folders to add .ost files.

add .ost files

Step 3. Select the required mailbox folders to transfer.

Select the required mailbox folders to import

Step 4. Choose Thunderbird as a saving option from the list.

Choose Thunderbird as a saving option to import

Step 5. Finally, click the Next button to start the procedure.

click the Next to import ost thunderbird

The software will start import emails from Outlook OST to Thunderbird application. Once done, you will be notified by the software with a successful message.

Now, open Thunderbird and check all the imported OST files into it.

Why Choose Advik OST to Thunderbird Converter

  • Bulk transfer: Outlook OST to Thunderbird tool precisely transfers OST files to Thunderbird in both Single as well as Multiple Transfer Mode. The tool supports Protected, Corrupted, Orphan & Encrypted OST to export messages from OST to Thunderbird in bulk.
  • Simple User Interface: The tool has the simplest User Interface which makes it easy to use for all kinds of users. You don’t need to be an expert to transfer OST file to Thunderbird account. You just need to follow a 3-4 steps process and the tool will directly import emails of OST file to Thunderbird account.
  • Include Attachment: Email files are incomplete without attachments. Hence, the tool is designed in such a way that it includes all essential information including attachment files during the email migration process. So that you don’t need to worry about any data loss and concentrate on work that matters the most.
  • Import Orphan OST File: You can easily import attachments, contacts, calendar, and other data from inbox, sent emails, trash emails, and other folders that are stored in your Orphan OST file. This tool supports almost all types of OST files such as discontinued, encrypted, corrupt, and damaged files.
  • No File Size Limit: You can import almost any size of OST file to Thunderbird account. There is no file size limit bound by this tool. You just need to select your OST file and follow simple steps to import your file directly to Thunderbird mailbox.

Watch How to Import OST File to Thunderbird


Here, we have discussed all the details about how to import OST to Thunderbird in this article. Both manual and automated solutions are explained with step-by-step instructions, so you can choose any of those. However, the free method is only workable if you have an active Outlook profile otherwise it is impossible to transfer OST file to Thunderbird.