How to Bulk Migrate Thunderbird to Claws Mail Securely?

  Rollins Duke
Rollins Duke   
Published: October 16th, 2025 • 6 Min Read

Overview: Do you want to migrate Thunderbird to Claws Mail? If yes, then you are on the right page. In this article, you will get the complete and informative knowledge to convert Mozilla Thunderbird to Claws Mail. You will also learn manual and professional methods to convert Thunderbird to Claws Mail.

Converting Mozilla Thunderbird to Claws Mail allows users to have a fast and lightweight email client while maintaining important and necessary emails. This process of migration from Thunderbird to Claws Mail helps in improving performance.

Introduction to Mozilla Thunderbird and Claws Mail

Mozilla Thunderbird
Thunderbird is a free and open-source email client. It has cross-platform compatibility and allows users to manage emails and contacts in one place.

Claws Mail
Claws Mail is a lightweight and open-source email client known for speed and simplicity. It provides email management features with a simple and clean interface.

Need to Migrate Thunderbird to Claws Mail

Users migrate Thunderbird to Claws Mail for gaining better speed and control over email management. This migration is done by people for multiple reasons mentioned below.

  • Claws Mail offers quick email loading and response times, which is very helpful for those users who are handling large mailboxes.
  • Claws Mail provides a clean, simple, and user-friendly interface.
  • It is known for its consistent performance and reliability.
  • It is an open-source email client. Therefore, users have full control over their data.

Manual Solution to Migrate Thunderbird to Claws Mail  

  1. Run the Mozilla Thunderbird email client and select the emails that you want to migrate.
  2. Right-click on the selected emails and then click on the “Save As” option.
  3. Now, browse the folder and select the “Mail Files” from there.
  4. Now, click on the “Save” option to migrate Thunderbird to Claws Mail.
  5. Then, run the Claws Mail email client and create a new folder where you want to import emails.
  6. Open the folder and click on the “Select File”, and then click on the “Import Messages”.
  7. Navigate to the EML file that you have exported.
  8. Lastly, select “All EML Files” and click on “Open” to import them.

Why Choose a Professional Solution over a Manual Solution?

  • The manual method is a complex and confusing process as it requires technical knowledge.
  • It can lead to missing or corrupted emails if improperly handled.
  • It is a time-consuming and lengthy process and requires a lot of effort.
  • There are chances that the embedded attachments and inline images may not transfer properly.
  • There is a chance that you might lose the folder hierarchy if done manually.

Independent Thunderbird to Claws Mail Migrator

The manual solution has a lot of limitations and is not reliable. Therefore, experts recommend using BitRecover Thunderbird Converter to migrate Thunderbird to Claws Mail quickly and securely. It is a reliable tool that converts Thunderbird to Claws Mail safely without losing any data. There is no need to install or download any other software along with this Thunderbird to Claws Mail Migrator.​

Steps to Migrate Thunderbird to Claws Mail using the Professional Solution

There are 2 easy phases to migrate Thunderbird to Claws Mail quickly and securely. The two phases are mentioned below.

Phase 1: Export Thunderbird Data to MBOX

  1. Install the Thunderbird to Claws Mail Migrator on your device and read all the instructions properly.
    thunderbird converter
  2. Now, click on “Emails” or “Contact & calendars” according to your requirements.
    convert emails and contacts
  3. Now, select the data automatically from the Thunderbird account or select it manually.
    choose thunderbird data
  4. Enable the “I am converting multiple users” option for multiple user’s profile and click on the Next icon.
    multiple accounts
  5. Now all the data will show on the software’s panel. Tick all the folders that you want to migrate.
    migrate thunderbird to claws mail
  6. Next, click on the “Select Saving Option” and choose “MBOX” from the drop-down.
    select mbox
  7. Now, browse the destination path, where you want to save the converted data.
    browse destination
  8. At last, click on the “Next” icon to start the procedure.
    procedure completed

Phase 2: Import MBOX File to Claws Mail

  1. Open the Claws Mail application on your system.
  2. Click on the “File” tab from the top of the corner.
  3. Now, choose the option “import MBOX File”.
  4. Browse the converted file and import it.

Expert Assistance: If you are facing any difficulty in using this Thunderbird to Claws Mail Migrator, you can choose our professional migration services. In this, our support team will remotely handle all the Thunderbird to Claws Mail migration process for you, ensuring complete data integrity, safety, and security throughout the process, as well as providing certificates for the same. You can also directly connect with the BitRecover Support Team and ask them to customize new features according to your work needs and requirements.​

Features of the Thunderbird to Claws Mail Migrator

  • The tool provides dual options to upload the mailbox data of Thunderbird.
  • Users can also convert Thunderbird to more than 25 export formats.
  • The Thunderbird to Claws Mail Migrator maintains the email properties, such as To, CC, and many more, during the migration process.
  • Users can convert complete data of Mozilla Thunderbird, including emails, contacts, calendars, and other complete data with attachments.
  • The tool also provides an Advanced Search option to find the desired email.
  • Users can bulk migrate Thunderbird to Claws Mail, and there is no need to install any other application along with this tool.
  • It can be accessed by anyone, whether the person has technical knowledge or not. Therefore, it has a simple, user-friendly, and beginner-friendly interface.
Conclusion

In this blog, we learned about the need to migrate Thunderbird to Claws Mail, manual and professional solutions, why prefer a professional solution over a manual solution and the features of the Thunderbird to Claws Mail Migrator. Therefore, after complete evaluation and keeping in mind data safety, security, and integrity, experts recommend using the professional solution. The above-mentioned professional solution is a must try tool if you want to convert Thunderbird to Claws Mail quickly with no data loss.

For More Assistance: If you have any doubt regarding the functioning, pricing, or features of the tool, you can directly email us at [email protected], or you can also opt for the live chat support. Our Support Team will shortly respond to you and can also schedule online meetings if required.

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