How to Import OLM File to Thunderbird Mac Profile

Written By Kumar Raj
Anuraag Singh
Approved By Anuraag Singh
Published On October 8th, 2022
Reading Time 5 Minutes Reading

Are you also looking for a solution to import OLM file to Thunderbird? If yes, then do not despair. This write-up explained a simple and straightforward approach to do so. All a user needs to do is read thoroughly till the end of the post.

With the advancement in technology, there are multiple email applications available. People keep switching from one to another in the search for a better alternative and better results. Among these email service providers, two are Mac Outlook and Mozilla Thunderbird. In Mac Outlook, an OLM file is created, while the MBOX file is formed in Thunderbird. Now, for many reasons, users need to move OLM to Thunderbird.

Reasons to Import OLM file to Thunderbird Profile on MAC OS X

Some of the probable factors which lead to the conversion of OLM to Mozilla Thunderbird have been explained here:

“I had a MacBook Pro and there are a lot of emails there. But, I am moving from Mac Outlook to the Thunderbird due to the official reasons. Now, I need all the data in Mozilla Thunderbird, but Thunderbird is not picking up the email database exported from Mac Outlook. Please, can you help me to import OLM file to Thunderbird Mac ? Any lead will be greatly appreciated.”

“I am using Thunderbird on a Windows PC, running on Windows 8. I also have a Mac Air running Mac Outlook whenever I am away from home. I have copied my OLM files in a folder, but it cannot be opened on my Thunderbird account. I have searched for converters online, but I cannot decide for which option to go with. Any advice is appreciated.”

Perfect Solution for Importing OLM File Into Thunderbird

The OLM file can be easily transferred to Mozilla Thunderbird with Mac OLM Converter, a trusted professional software. According to the technical experts, it is the best choice to import OLM file to Thunderbird Mac. The software panel contains all the options necessary for data conversion. It produces consistent results just after a few clicks.

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Step-Wise Procedure to Convert OLM to Thunderbird Profile

Whenever it is necessary to perform the migration of data in a hassle-free manner, the first step is to convert OLM to MBOX format. Then, import the resultant file into Mozilla Thunderbird.

The instructions to carry out the first step are here:

1. Open OLM to Thunderbird converter on the local system. The first screen of the product will emerge on the screen.

2. After that, hit on the Add File (s) or Add Folder (s) option.

3. Navigate and choose OLM files to convert into another file format.

4. The application displays the OLM file on the user interface after selection.

5. After that, press the Next option.

6. From the Export Type option, choose the MBOX radio button.

7. There is an option to apply “Advance filters” during the migration process with ease:

  • Date Filter: The tool exports the data as per the date in the “From” and “To” sections.
  • Categories: Choose the categories to export. Also, keep in mind that the software exports emails in MBOX format, calendars in ICS, and contacts in VCF format.

8. Then, hit on Change button to specify the final destination to save the exported MBOX files. Select the location and click on Choose. The selected destination path will appear in the text box.

9. Hit on the Export button to import OLM file to Thunderbird supported format.

10. The screen displays the progress report. Once the entire process finishes, a message appears on the display screen. Then, hit on OK.

11. The export report can be saved on the local machine. Hit on the View Report button.

12. The entire report and the converted file are available at the destination location.

Now, the user can import Outlook OLM to Apple Mail, Thunderbird, or other MBOX compatible programs at their convenience.

Got The MBOX File? Now Import It in Thunderbird Application!

To import MBOX file to Thunderbird, users can make use of the free ImportExportTools NG add-on. This add-on is available for both Windows and Mac Thunderbird users. The steps are also similar for both variants.

  • Download and Install the “ImportExportTools NG” addon in Mozilla Thunderbird.
  • Then, right-click on “Local Folders” and select the “ImportExportTools NG” option.
  • Select “Import MBOX file” from the available list of given options.
  • Then, click on the OK button.
  • After that, select the MBOX file obtained after conversion, then click on Open button.

Voila! All the OLM data is now available in Mozilla Thunderbird under the Local Folders sections. Now, the user can easily move the data into other mailbox folders as per convenience.

The Final Words

It is evident that when users want to import OLM file to Thunderbird, file conversion is a must. After all, Thunderbird does not support OLM files. That’s why this article contains proper step-by-step instructions to migrate OLM data file into Thunderbird on Mac or Windows machines. All it requires is a time-tested software application to get the job done.

Frequently Asked Questions

Some general queries faced by the Mac Outlook users while conversion of Mac OLM into Thunderbird are:

1. Can I convert OLM files from Outlook 2016 using this converter?
Yes, the tool migrates Mac Outlook 2011, 2016, and 2019 OLM files to Mozilla Thunderbird without any issues.

2. Does the application support moving data from multiple OLM files to Thunderbird in Windows operating system?
Yes, the software supports to add and convert multiple OLM files at once. It generates MBOX file compatible with Thunderbird regardless of the Operating system. So, the user can easily move the file to Windows system and import it in Thunderbird.

3. Is there any file size limitation on the size of the OLM file?
No, the application does not impose any limitations on the size and number of OLM files to process.


By Kumar Raj

He is an ardent tech enthusiast and has a specialization in simplifying complex tech topics. With a knack for staying ahead of the curve, he provides readers with up-to-date insights into the ever-evolving tech world. When he is not writing, he enjoys exploring new gadgets and is actively engaged in tech communities.