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Best Methods to Convert Thunderbird Emails to EML Format

Admin | Email Conversion email migration file conversion How to's Software Technology | 4 minutes read | Modified on: 19-03-2026
convert thunderbird emails to eml

Email data management becomes essential when switching between platforms or creating backups. Many users rely on Mozilla Thunderbird for everyday email handling, but sometimes they need to convert their emails into EML format for compatibility, sharing, or migration purposes.

Since Thunderbird stores emails in MBOX format, and many other email clients support EML files, converting Thunderbird emails to EML is a practical solution. And if you are wondering how you can perform the migration then this guide will explain different methods to convert Thunderbird emails to EML format easily with helpful tips.

What is an EML File?

An EML file format is used to store individual emails. Each EML file contains email subject, sender and recipient details, message body, attachments, metadata and headers. EML files are supported by various email clients, including Microsoft Outlook, making them ideal for sharing and migration.

Why Convert Thunderbird Emails to EML?

There are several reasons why users export Thunderbird emails into EML format.

1. Cross-Platform Compatibility

EML files can be opened in multiple email clients without compatibility issues.

2. Individual Email Storage

Each email is stored separately, making it easier to manage.

3. Easy Backup

Users can save important emails as standalone files.

4. Migration Support

EML format is widely used for transferring emails between platforms.

5. Simple Sharing

You can easily share individual emails as files.

Method 1: Use ImportExportTools NG Add-on

One of the most effective methods to convert Thunderbird emails to EML is using the ImportExportTools NG add-on in Thunderbird.

Step 1: Install the Add-on

  • Open Mozilla Thunderbird.
  • Click on the menu icon and select Add-ons and Themes.
  • Search for ImportExportTools NG.
  • Install the add-on and restart Thunderbird.

Step 2: Export Emails to EML

  • Right-click on the mailbox folder.
  • Select ImportExportTools NG.
  • Choose Export all messages in the folder.
  • Select EML format.         
  • Choose a destination folder.
  • Thunderbird will export all selected emails as EML files.

Limitations

  • Requires add-on installation
  • May take time for large mailboxes

Method 2: Drag and Drop Emails

Another simple method to convert Thunderbird emails to EML format is dragging emails directly from Thunderbird.

Steps

  1. Open Mozilla Thunderbird.
  2. Navigate to the folder containing emails.
  3. Select one or multiple emails.
  4. Drag them and drop into a folder.
  5. The emails will be saved automatically as EML files.

Limitations

  • Not suitable for large-scale conversion
  • Requires manual effort

Method 3: Save Emails Individually

You can also save each email manually.

Steps

  1. Open the email in Mozilla Thunderbird.
  2. Click File and Save As.
  3. Choose EML format.
  4. Select the destination folder and save.

Limitations

  • Time-consuming
  • Not practical for multiple emails

Method 4: Use Professional Conversion Tools

For users dealing with large volumes of email data, the CubexSoft Thunderbird to EML Converter Tool provide the most efficient solution to all the migration challenges. The tool comes efficiently manages all the Thunderbird emails directly to EML format without losing any data. It offers bulk folder export, automatic file selection option, direct transfer, selective file conversion, and many more. The tool also supports all the Windows and Mac versions. It preserves the original folder structure and saves all the data and attachments. It has a very smooth and easy interface to help the users migrate smoothly. Users can also check out its working efficiency using the free trial which let users to convert up to 20 emails from the mailbox for free.

The Key Features
  • Bulk conversion of emails
  • Maintains folder hierarchy
  • Preserves attachments and metadata
  • Fast and reliable processing
  • User-friendly interface
Easy Steps to Convert Thunderbird Emails to EML
  1. Install the Thunderbird to EML Conversion Tool.
  2. Launch the software.
  3. Add Thunderbird MBOX files or profile folders.
  4. Preview the emails.
  5. Select EML as the output format.
  6. Choose the destination location.
  7. Start the conversion process.

After completion, all emails will be available in EML format.

Tips for Successful Conversion
  • Follow these tips for better results.
  • Always create a backup of Thunderbird emails before conversion.
  • Arrange emails into proper folders for easy export.
  • Ensure attachments are properly included in the converted files.
  • Convert a small batch before processing large mailboxes.
Conclusion

Converting emails from Mozilla Thunderbird to EML format is essential for users who need better compatibility, easier sharing, and efficient email management. Since Thunderbird uses MBOX format, converting emails into EML ensures that individual messages can be accessed across different platforms.

Users can use methods such as ImportExportTools NG, drag-and-drop, manual saving, or the professional Thunderbird Converter Tool to complete the process.

By following the steps outlined in this guide, you can easily convert Thunderbird emails to EML format while preserving important data, attachments, and formatting.