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How to Import OST to Thunderbird Account | Instant Result

  author
Jamie Kaler   Contribution
Rollins Duke
Rollins Duke  Approved By
Published On March 12th, 2025 • 3 min read

When we try to migrate from Microsoft Outlook to Mozilla Thunderbird, the challenge arises with the OST files. OST files, used by Outlook to store data offline, are not compatible with Thunderbird. To import OST to Thunderbird, we need an appropriate method to convert the files and then get them into the Thunderbird profile.

Here, we will find out different approaches to opening an OST file in Thunderbird. Get the preferred method from the below write-up.

Understand the Challenges in OST to Thunderbird Migration

As we discussed before, the OST does not support the Thunderbird interface. Before that, let’s find out what the OST files are. OST files are linked to the specific Exchange Server profile. They are designed for offline access and synchronization with the server. Whereas Thunderbird uses MBOX or Maildir format to store emails. Therefore, a direct import is not possible. The process needs to convert the OST file to a compatible format and then migrate it into Thunderbird.

Reasons to Import OST to Thunderbird Account

The reasons might vary from user to user to migrate OST files into Thunderbird.

  • Thunderbird is a few and open-source email client. It eliminates the licensing cost associated with MS Outlook.
  • For some users, Thunderbird offers a more lightweight and responsive experience as compared to Outlook.
  • Thunderbird is compatible with macOS, Windows, and Linux, offering greater flexibility.
  • We can easily back up and move the data from Thunderbird to another with the import options.
  • It also includes customization options for the users to import the functionality with the extensions or add-ons.

Manually Import OST to Thunderbird Account

  • Launch the Thunderbird email client.
    start thunderbird and select tools
  • Go to Tools>Import option from the Thunderbirdgo to import
  • Then, choose Import from Outlook and click Continue.select import from outlook
  • Select the required items to import from the OST and tap on Continue.select the options
  • Press the Start Import button.import ost to thunderbird
  • The process is completed successfully.

Limitations of the Manual Method

  • The method is time-consuming.
  • There is a higher chance of data loss.
  • Technical expertise is required for some steps.

Use the Expertise Method to Import the OST File into Thunderbird

To convert OST to Thunderbird, try the OST Converter tool. Use the saving option as MBOX and convert the files to a Thunderbird-compatible format. Further, the user can move the converted files into the profile with ease. With a few clicks, you can perform batches of file conversion to save time and get 100% accurate results.

How to Convert OST File to Thunderbird Account?

  • Start the software and follow the steps.
    start the software
  • Add OST files using to import OST to Thunderbird.
    add ost file
  • Choose the MBOX file format from the saving options.select mbox to convert ost to thunderbird
  • Set a location to store the converted files.
    select desired location
  • Press the Export button to start the conversion.

Conclusion

Migrating OST to Thunderbird can be a smoother and more efficient process with the right approach. Some users with more technical expertise might prefer the manual over the automated method. However, you can use the recommended software for direct and batch transfer of OST to Thunderbird. Import OST to Thunderbird in bulk without the need for any technical knowledge. Follow the steps outlined in this guide and choose the software.