Simple Guide to Convert Pegasus Mail to Thunderbird Account

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  • Updated on February 14th, 2026

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For business users, shifting to a modern and scalable email client becomes a necessity in today’s digital workflow. Hence, the user is compelled to convert Pegasus Mail to Thunderbird for updated security protocols. Through this technical blog, we will look at both a professional method and a free method to convert the Pegasus Mail to Thunderbird. With the professional tool, the Cigati Pegasus Mail Converter, users can be assured of authentic, error-free, and reliable conversion.

Élodie Martin from France asked: “Bonjour, I am Élodie Martin. I am using Pegasus Mail for my emails, and I want to switch to Thunderbird. How can I convert or migrate all my Pegasus Mail emails, folders, and attachments to my Thunderbird account safely? I also want to make sure nothing gets lost during the process. Are there any manual methods or tools that work well for this migration?”

Benefits of Pegasus Mail to Thunderbird Conversion

With a modern UI and reliable cross-platform accessibility, Thunderbird is a more practical choice for migrating emails. Given below are the benefits of the same: 

  • Thunderbird has a cleaner, modern layout and an easy-to-navigate interface that simplifies mailbox management.
  • Compared to Pegasus Mail, Thunderbird regularly receives security patches and feature updates. 
  • The Thunderbird email client works well with popular email services like Gmail, Outlook, and more. Along with this, it supports modern authentication methods.
  • Unlike Pegasus Mail, Thunderbird has many modern productivity features such as advanced search, filters, tags, etc.
  • As security threats evolve, Thunderbird supports modern encryption standards and secure internet connections. 

Free Methods to Convert Pegasus Mail to Thunderbird Account

In this section, we will look at 2 free-manual methods and then a professional method for Pegasus Mail to Thunderbird conversion. Let us begin with the manual methods first. 

Migrate from Pegasus Mail to Thunderbird Using IMAP Sync

This method involves first transferring emails from Pegasus to an IMAP account. Then, add the same IMAP account to Thunderbird and allow it to sync. 

Let us now look at the steps to begin the process:

  1. Open the Pegasus Mail on your system.
  2. Then, go to Tools > Internet Options and add your IMAP-enabled account.
  3. Click on Save Settings and restart Pegasus Mail.
  4. After that, select the emails and drag and drop them from Pegasus Mail to the IMAP account.
  5. In Thunderbird, sign in with the same IMAP-enabled account.
  6. Now, allow sometime to Thunderbird to sync the emails.

Limitations: Syncing hundreds of emails into Thunderbird can take a lot of hours. This makes the process time-consuming. Also, if there are any network interruptions during the migration, emails will get lost or lead to duplication. 

Convert Emails from Pegagus Mail to Thunderbird

In this manual approach, we’ll save emails in an EML format and then export them into Thunderbird using an add-on. 

The following is the step-by-step process to begin:

  1. First, launch Pegasus Mail and go to the mailbox containing the emails to convert.
  2. You can select a single email or multiple emails for bulk selection.
  3. After that, navigate to the Save as or Export button to save the selected emails as .eml files. 
  4. Now, open the Thunderbird application on your system.
  5. Next, drag and drop the EML files into a Thunderbird account folder. 

Limitations: If there are thousands of emails to convert, the conversion process takes a long time. The original folder hierarchy may not get carried over properly. Also, the manual approach increases the chances of human errors, which can lead to missing emails. 

Simple and Quick Solution to Convert Pegasus Mail to Thunderbird

The Cigati Pegasus Mail Converter is a comprehensive solution that efficiently converts emails in a Thunderbird account. This tool efficiently converts multiple Pegasus emails to Thunderbird, ensuring high accuracy and high-speed. Also, the tool keeps the original folder structure intact and maintains the data integrity throughout. With multiple export formats, the tool ensures smooth compatibility across platforms. 

Simplified steps to perform Pegasus Mail to Thunderbird conversion:

  1. Download the converter tool on your Computer.
  2. Then, tap Continue to proceed to the next step.
  3. After that, click on Add File, browse the Pegasus Mail file, and Open it to add it.
  4. Next, in the left-panel, expand the folder structure, select the folders to convert, and preview them. Click Next again to continue.
  5. Choose MBOX from the Saving options and opt for the filters if required.
  6. Furthermore, select the destination location to save the MBOX file and then hit Convert.

Now, we will import the downloaded MBOX file into Thunderbird by following the steps below:

  1. Open Thunderbird and go to Tools > Add-ons and Themes.
  2. Then, search for and install ImportExportTools NG and restart Thunderbird.
  3. Navigate to Local Folders and right-click on it, select ImportExportTools NG > Import mbox files.
  4. After that, select Import directly from one or more mbox files > Ok and browse the downloaded MBOX file. 

Conclusion

The Pegasus Mail to Thunderbird conversion is important for upgrading to a modern email architecture. This blog will walk you through 2 methods to convert Pegasus Mail to Thunderbird account. We will learn about both free and professional methods using the Cigati Pegasus Mail Converter. Experts recommend this professional tool for its intuitive UI, reliable results, and error-free conversion experience.

You May Also Read: Convert Pegasus Mail to Outlook

Frequently Asked Questions

Q: Does Thunderbird natively import Pegasus Mail data?

Ans: No. Thunderbird does not natively import the Pegasus Mail data. Pegasus Mail files are in .PM, .DAT, and .MSG file formats. To import it into Thunderbird, it needs to be converted to an MBOX format.

Q: Can I migrate multiple folders at once?

Ans: Yes. With the manual method, convert multiple Pegasus Mail files into EML format and then import them into Thunderbird. Moreover, using the professional converter tool, you can migrate emails in bulk at once.

About The Author:

Rohit Singh is an Email Backup, Recovery & Migration Consultant and is associated with Software Company from the last 3 years. He writes technical updates and their features related to MS Outlook, Exchange Server, Office 365, and many other Email Clients & Servers.

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