How to Import OLM to Thunderbird? A Step-by-Step Guide

Published On - March 10, 2025 by Nasir Khan | Reading Time: 4 minutes

Are you finding it difficult to move emails from Outlook for Mac? We are here to help you do it without any hassle and risk of data loss. If you prefer to migrate to Thunderbird, it’s a great choice as Thunderbird can be accessed on both Mac and Windows. For that, you need to import OLM to Thunderbird. However, it is next to impossible if done manually, as Thunderbird does not support OLM format. Therefore, this blog discusses the most effective solution in your favor for bulk conversion of OLM files. Read till the end and discover about Regain OLM Converter Software.

Why Import OLM Files into Thunderbird?

In today’s world, email management is a crucial part of personal and professional life. Outlook for Mac is an email client for users of Mac. It is widely used for emailing and other purposes and it stores data in OLM format. This application offers structured email management, however, it is limited to macOS. As a result, many users prefer more versatile email applications like Mozilla Thunderbird.

Thunderbird is a desktop-based email client with open-source nature and cross-platform support. Also, it is a more user-friendly and cost-effective choice. So, users look for a solution to import OLM to Thunderbird without losing important data.

Other scenarios that compel this conversion are:

• When users are switching from a Mac Operating system to Windows or Linux, Thunderbird is the best choice.
• Users often switch from Outlook to Thunderbird to reduce emailing costs. Outlook requires subscription plans, unlike Thunderbird.
• They can customize their emailing experience with Thunderbird by installing various add-ons.
• If you encounter any crash or performance issues in Outlook, switching email clients is an option.
• Many users also look for OLM to Thunderbird migration due to its simple interface, smart folders, and powerful search feature.
• Thunderbird supports accessing multiple email accounts at once, so users can manage all email accounts on the same platform.
• If users do not have access to Mac Outlook anymore, importing OLM to Thunderbird is needed to access old emails.

Best Solution to Import OLM to Thunderbird

Before you begin to perform the procedure, here are some to-dos:

• Firstly, you need to have OLM saved on your PC.
• Ensure you have created an extra backup file for security.
• It is a must to install and configure with the latest version of Thunderbird.

Now, let us proceed to the solution. There is no direct manual approach to migrating OLM files into Mozilla Thunderbird. You can convert OLM to MBOX and later export MBOX to Thunderbird using the OLM to Thunderbird Converter Tool. Here is the best approach suggested by experts.

Use Professional OLM to Thunderbird Converter

With the most secure and fastest software, you can convert OLM to Thunderbird within minutes. Regain OLM Converter Software is the comprehensive utility you need for direct migration. It allows to convert OLM in bulk without data loss. The software enables users to access OLM emails without Mac Outlook and save mailbox data in a compatible format. Follow the step-by-step guide below to Import OLM to Thunderbird.

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Step 1: Convert OLM Files to MBOX Format

1. Download and install the Software on your PC. Run it.
2. Click on Open and browse for OLM files to convert.
3. Select files from your PC and click Open to add them.
4. The preview panel opens. Select the folders you need to convert.
5. Click on the Export button and choose MBOX as saving format.
6. Specify the location on your PC to save the MBOX file.
7. Click on Convert Now to begin OLM to MBOX Conversion.

Step 2: Import MBOX to Thunderbird

After you have saved OLM emails into MBOX, do as directed to import MBOX in Thunderbird:

1. Open Thunderbird on your system.
2. Install the ImportExportTools NG add-on.
3. Next, go to the Local Folders in Thunderbird.
4. Right-click on Local Folders >Select ImportExportTools NG.
5. Further, choose Import MBOX file and click OK to proceed.
6. Browse and select the required MBOX file.
7. At last, click Open to begin importing your emails.

Hence, your OLM emails are successfully imported to the Thunderbird mailbox.

Why Regain Software is the Best Choice?

Unlike other software, Regain Software is embedded with multiple advanced features, some of which are listed below:

• Saves your time and effort with the batch-conversion feature.
• Export OLM emails to PST, MBOX, EML, PDF, MSG, and more.
• Retains the original folder structure, email attributes, and attachments.
• Does not need Outlook for Mac installation to convert OLM files.
• Developed with advanced algorithms supporting quick and safe conversion.
• Allows conversion of OLM files of all sizes, including large ones.
• Easy to use for beginners and compatible with all Windows OS.

Conclusion

Migrating emails from Outlook for Mac to Thunderbird is a challenging task, but it is easier with the right approach. As there is no direct migration procedure, this blog discusses the best professional software to import OLM to Thunderbird without risk of errors. We have mentioned a step-by-step guide for ease of migration and stated why you should choose Regain software. Verify all the functionalities of the tool by free demo version.

Frequently Asked Questions-

Q. Can I Import Outlook Files into Thunderbird?

Ans– Yes. You can easily import Outlook files into Thunderbird mailbox. But, you need to convert PST, or OLM files to Thunderbird-compatible format first. Thunderbird supports MBOX format and you can convert PST or OLM files to MBOX using a professional tool. For Outlook PST files, use PST Converter where as OLM Converter allows converting OLM to MBOX. Further to import MBOX into Thunderbird, install the ImportExportTools NG add-on.

Q. How to bulk convert OLM to PST?

Ans– The best way to convert OLM to PST in bulk is using the Regain OLM to PST Converter Tool. Do as the steps follow:

1. Run the software and add OLM files to the wizard.
2. Preview emails and select the folders to convert.
3. Go to Export > Choose PST saving option.
4. Define the saving path and click on Convert Now.