Moving from Outlook to Thunderbird? Convert PST to EML Easily

jolly singh
jolly singh
July 25, 2026 · 7 min read
Moving from Outlook to Thunderbird? Convert PST to EML Easily

Introduction

Microsoft Outlook is among the most popular desktop email clients for managing business and personal emails. It keeps mailbox data in PST (Personal Storage Table) files that include emails, contacts, calendars, tasks, notes, and attachments. But users often find that they cannot open PST files directly when they want to switch from Outlook to Mozilla Thunderbird or any other EML-supported email client.

This presents a major problem as Thunderbird does not natively support PST files and works differently. This situation makes it difficult for users to access their old Outlook emails, especially when they need to move years of important business communication. Hence, in such cases, converting PST files to EML format is one of the best ways to access Outlook emails in Thunderbird and other EML-supported applications.

This guide explains the cause of this problem, the shortcomings of manual migration, and how DataVare PST to EML Converter Expert helps users to execute a structured Outlook to Thunderbird migration.

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Why is it necessary to convert PST to EML?

What many users do not realize is that Outlook and Thunderbird use different mailbox formats.

Different Email File Formats

Microsoft Outlook stores mailbox data in PST files, whereas Thunderbird stores emails in a totally different format. That means you can’t just copy PST files and open them in Thunderbird.

Moving Email Clients

Many companies switch from Outlook to Thunderbird to save on software costs or use an open-source email client. Outlook emails need to be converted to a compatible format before migration.

Individual email sharing

Most users only need individual email messages, not an entire PST file. The EML format makes it much easier to share and import emails.

Improved Email Portability

Many email clients support EML files, making them easier to access across different platforms.

Common Problems Users Face When Migrating

Moving your emails from Outlook to Thunderbird might look straightforward, but many problems can occur during the migration process.

Thunderbird Cannot Open PST Files.

Since Thunderbird does not directly support Outlook PST files, users are unable to access the archived mailbox data.

Large PST files are troublesome to work with.

Outlook users often have mailbox files that contain thousands of emails accumulated over many years. Manual migration becomes excruciatingly slow.

Folder Structure Becomes Messy

Using the wrong migration method can change the original folder hierarchy, making it difficult to locate emails after the migration.

Attachments Must Stay Attached

Business emails contain contracts, invoices, reports, and project documents. Users want these attachments to remain with their original emails.

Email Formatting Changes

Manual conversion may result in changed sender information, recipients, time stamps, HTML formatting, or embedded images.

Why you can’t always migrate manually

There are manual ways, but they usually require some technical knowledge and additional software.

Some common constraints include:

·         Several complicated steps.

·         Slow with large PST files.

·         Export individual emails.

·         Increased chance of manual errors.

·         Folder organization might change.

·         Bulk mailbox migration is difficult to manage.

These challenges become even greater when organizations need to migrate several Outlook mailboxes.

PST to EML Converter Expert - Product Review

PST to EML Converter Expert is a Windows-based application that is specially designed to convert MS Outlook PST files into separate EML files. Instead of manually exporting emails one by one, the software scans the mailbox and creates EML files that can be imported into Thunderbird, Windows Live Mail, eM Client, Windows Mail, and other EML-supported email applications.

The software migrates not only emails but also keeps important mailbox properties intact during the migration. It attempts to preserve the sender, recipient, subject line, timestamp, attachments, HTML formatting, and original folder hierarchy (where possible). This means users can access their migrated email without spending additional time reorganizing mailbox folders.

Another useful feature is the batch conversion, which allows users to convert multiple PST files simultaneously. This feature is very useful for businesses, organizations, and IT administrators who are migrating multiple Outlook mailboxes.

The software offers a mailbox preview option that allows users to preview their Outlook data before initiating the conversion. That reduces the chances of exporting the wrong mailbox folders.

The software is said to be compatible with several versions of Microsoft Outlook and several versions of the Windows operating system. It also has a free demo version for evaluation. The personal license is $29. Business and enterprise licenses are also available for users with larger migration needs. Prices are subject to change, so users should check the latest information on the official website before purchasing.

Key Features at a Glance                    Feature Benefit to Users

Batch PST Converter                          Combine multiple PST files in one go.

Preserve folder structure                Keeps your mailbox folders clean and organized.

Email Properties Keep                     Sender, recipient, subject, times, and formatting.

Attachment Preservation               Converts e-mail messages and their attachments.

The preview option enables users to view mailbox data before the conversion process.

EML Compatibility: The created EML files can be imported in Thunderbird and other supported email clients.

How to Convert PST to EML in Easy Steps

Step 1: Download and Install DataVare PST to EML Converter Pro

Step 2: Select the Outlook PST file.

Step 3: See mailbox folders and messages.

Step 4: Select the destination location.

Step 5: Initiate the conversion process.

Step 6: Import the generated EML files into Thunderbird or another compatible email client.

Conclusion

Thunderbird does not directly support PST files, which makes it a little bit complicated when migrating from Microsoft Outlook. Manual migration often requires additional effort and does not preserve mailbox organization, email formatting, or attachments. A dedicated solution for PST to EML conversion helps users to move Outlook emails to a widely supported format while retaining important mailbox properties. Users should verify compatibility, support for batch conversion, preservation of folder hierarchy, and availability of a trial version for a smooth migration experience before choosing any conversion software.

FAQs

1. Why can’t Thunderbird read PST files directly?

Thunderbird does not natively support PST files from Outlook. The PST emails are converted into EML format, which is compatible with Thunderbird and other EML-based email clients.

2. Are attachments kept after converting PST to EML?

Yes. Professional PST to EML conversion tools are developed to keep email attachments along with original email content and properties.

3. Is it possible to batch convert PST files?

Yes. Batch conversion enables users to convert multiple Outlook PST files at once, saving time during large migrations.

4. Does the software keep folder hierarchy?

Yes. The software is built to preserve the original mailbox folder structure wherever possible, so users can maintain their emails organized after migration.

5. Is there a trial version before I buy it?

Yes. PST to EML Converter Expert's free demo version to evaluate it before purchasing a license. According to the official product information, PST to EML Converter Expert is available in a demo version for evaluation before purchasing a license.

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