How to Convert Thunderbird Emails to MSG on Mac?

admin | email migration how to macOS Mozilla Thunderbird software technology Thunderbird | 4 minutes read | Modified on: 16-05-2026
convert thunderbird emails to msg on mac

Mozilla Thunderbird is one of the most popular open-source email clients used by individuals and businesses for managing emails across multiple accounts. While Thunderbird stores mailbox data in MBOX format, many users who uses MacOS often need to convert Thunderbird emails to MSG on Mac for better compatibility with Microsoft Outlook and other Windows-based applications. MSG is a proprietary file format developed by Microsoft to store individual email messages along with attachments, metadata, formatting, and contact information.

The Thunderbird to MSG migration becomes important when users migrate from Thunderbird to Outlook, share emails with Outlook users, or maintain email records in a universally accepted business format. In this guide, you will learn the reasons behind Thunderbird to MSG conversion, manual methods, limitations of manual techniques, and a professional solution that simplifies the entire process on Mac.

Primary Purpose to Convert Thunderbird Emails to MSG on Mac

There are several situations where users need to export Thunderbird emails into MSG format:

1. Migration to Microsoft Outlook

Many organizations shift from Thunderbird to Microsoft Outlook for better enterprise collaboration and integration with Microsoft services.

2. Better Email Compatibility

MSG files are easily accessible in Outlook and preserve all email properties accurately.

3. Individual Email Storage

Unlike MBOX files that store multiple emails together, MSG saves each email separately, making management easier.

4. Legal and Compliance Requirements

Businesses often save important emails in MSG format for documentation and compliance purposes.

5. Easy Email Sharing

MSG files can be shared individually with attachments and formatting intact.

6. Backup and Archiving

Users prefer MSG format for long-term email storage because it preserves complete email structure and metadata.

Read More: How Do I Export Thunderbird to CSV?

Manual Way to Convert Thunderbird Emails to MSG on Mac

There is no direct option in Thunderbird to export emails into MSG format on Mac. However, users can try a manual workaround using EML conversion and Outlook.

  1. Launch Thunderbird and select the mailbox folder containing the emails you want to export.
  2. Select the desired email.
  3. Drag and drop the email to the desktop.
  4. Thunderbird saves the email in EML format.
  5. Repeat the process for multiple emails if required.

Note: To continue the process, Microsoft Outlook must be installed on your Mac system.

  1. Open Outlook.
  2. Drag the EML files into an Outlook folder.

Outlook on Mac does not always provide a direct MSG export option like Windows Outlook. Therefore, users may need additional scripting or Windows Outlook access to generate MSG files.

Limitations of the Manual Method

  • Time-consuming for bulk email conversion
  • No direct MSG export option on Mac Outlook
  • Risk of losing attachments or formatting
  • Requires technical knowledge
  • Multiple applications are needed
  • Difficult to maintain folder hierarchy
  • Not suitable for business or enterprise migrations

Due to these limitations, users generally prefer a professional solution for accurate and hassle-free Thunderbird to MSG conversion.

Professional Approach to Convert Thunderbird Emails to MSG on Mac

The MacMister Thunderbird Converter Tool for Mac is the most reliable solution for converting Thunderbird emails into MSG format on macOS systems with complete accuracy. This advanced utility allows direct conversion within seconds. It is specially designed for Mac users and supports batch migration with complete email properties. The software allows users to export Thunderbird emails along with attachments and email formatting while preserving folder hierarchy and metadata. It supports batch conversion, enabling users to convert multiple Thunderbird mailbox files at once without file size limitations.

The tool also provides selective export options, file naming features, and live conversion preview for better management. Compatible with all major macOS versions, the Mac Thunderbird Converter offers a simple interface and secure offline conversion process for hassle-free email backup and archiving. A free trial is also provides to the users to explore the software and migrate up to 25 emails from the selected mailbox without any cost.

Steps to Convert Thunderbird Emails to MSG on Mac Using Professional Solution

  1. Install the application on your Mac machine and open the software after installation.    
  2. The application automatically detects Thunderbird profiles or you can also manually add Thunderbird files if needed.
  3. The software displays all mailbox folders select and deselect the required folders for conversion.
  4. From the export options list, select MSG as the saving format and choose the required destination path.
  5. Click the Export button to begin Thunderbird to MSG conversion on Mac.

Features of Professional Thunderbird to MSG Converter

  • Batch Conversion

The software supports bulk conversion of Thunderbird emails into MSG format without any file size limitation.

  • Preserves Email Formatting

The Mac tool for Thunderbird conversion maintains Email formatting, Inline images, Attachments, Metadata

  • Maintains Folder Hierarchy

All mailbox folders remain organized even after conversion.

  • Advanced Email Filters

Users can export only selected emails based on various filter options.

  • User-Friendly Interface

The tool is designed for both technical and non-technical users.

  • Fast Conversion Speed

The application converts thousands of emails quickly while maintaining accuracy.

  • Supports All Thunderbird Versions

Compatible with all major Thunderbird editions on Mac.

  • Secure and Reliable

No data modification or loss occurs during the conversion process.

  • Preview Option

Users can preview emails before starting the export process.

  • Multiple Export Formats

Apart from MSG, the software can also export Thunderbird to PDF, PST, EML, MBOX, HTML, Office 365, and Gmail. Yahoo Mail, etc.

Conclusion

Migrating Thunderbird emails to MSG on Mac is essential for users migrating to Outlook or managing emails in a more accessible format. Although manual methods exist, they are complicated, time-consuming, and unreliable for large-scale conversions. Using the mentioned Mac Thunderbird to MSG solution makes the process simple, fast, and secure. The software enables users to export Thunderbird emails into MSG format while preserving complete email properties, attachments, and folder hierarchy. If you are looking for a reliable way to convert Thunderbird emails to Office 365 on Mac without technical complications, the Mac Thunderbird Converter is the best choice.