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Hassle-Free Ways to Convert OLM to Thunderbird Desktop on Windows

Shubham Dixit   
Published: Oct 3, 2023 • Convert • 5 Min Read

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Are you looking for a reputable method to convert OLM to Thunderbird? If you answered yes, this article addresses your worry and provide you the best methods to complete this task without facing hassle.

Numerous email clients now have more complex functionality. With the advancement of functionalities, customers increasingly migrate from one Email Client to another based on their own requirements.

OLM files correctly hold emails, attachments, contacts, journals, to-do lists, as well as other data items.   These are not compatible with Outlook for Windows. On the other hand, Thunderbird is an email client software that doubles as a personal information manager and has a slew of additional capabilities.

There are several people that require OLM to Thunderbird account conversion. We recognise that a user may be required to execute this action for a variety of reasons. As a result, we’re going to describe the rationale and solution for completing this assignment.

Reasons to convert OLM to Thunderbird Desktop account

“I’ve been using Outlook for Mac, but just had to convert to Thunderbird owing to a shift in my workplace. I’m required to migrate all of my info to Thunderbird. Could someone please explain how to convert a Mac Outlook OLM file to Thunderbird file? As I have Outlook for Mac installed with my critical file. Thanks.”
“I have a recently acquired a new Windows laptop where Thunderbird application is installed. From so many years, I am using Mac Outlook and have lots of documents. Now, I need to transfer from Mac to Windows platform totally. I am seeking for a solution that allow me to move all OLM files onto Thunderbird desktop account. Please offer me a method to perform this task.”

As with the preceding inquiries, there are several similar ones on the internet. Therefore, without further ado, let us go to the answer.

Methods to Convert OLM into Thunderbird Account

We’ll go through two different approaches to doing this work in the section below. Both the manual and professional methods are available for converting your OLM files into a Thunderbird profile. So, first and foremost, attentively examine each of the options and then determine which one is the best fit for you.

Method 1: Step by Step Manual process to perform this task

There are numerous processes that must be completed in order to do this work manually, as shown below.

Phase 1: Get your OLM files from Mac Outlook

  • To begin, open Mac Outlook for Mac Machine.
  • Then, navigate to the tool tab and select Import from the drop-down box.


  • “What do you want to import?” it now asks. Select “Outlook for Mac archive file .olm” from the drop-down list, and then convert the OLM file that appears.


Phase 2: Save your files as MBOX format

  • Open Outlook for Mac on your computer and log in.
  • Now select the folder and drag it into the screen’s upper right corner.
  • After that, the resultant  file will display on your computer’s desktop.

Phase 3: Now, convert these files in Thunderbird account

  • To begin, launch the Thunderbird email software program.
  • Install the ImportExportTool NG add-on on your Thunderbird application once you have completed the previous steps.


  • Then, using the right-click menu, choose the left panel.
  • From the ImportExportTools NG menu, select ImportMBOX and click on Ok.


  • Select “Import one or more MBOX files” from the drop-down menu, and then click the OK button.


  • Now, please select the resultant MBOX files.


That’s it.

Disadvantages of the manual procedure

  • Lengthy, time-consuming, as well as hectic process.
  • Doesn’t support the bulk conversion from OLM to Thunderbird.
  • For this, technical expertise is must.
  • Supportive application installation is very important.
  • The possibility of data loss is quite high.

Method 2: Convert OLM to Thunderbird with amazing professional app

In order to overcome these limitations, it is suggested to use any professional app. 3Steps Software is highly recommended app by many IT professionals. This software allows users to convert unlimited OLM files to Thunderbird desktop. With this app, one can convert OLM emails to Thunderbird along with all the attachments.

Additionally, when you convert your OLM into Thunderbird, the properties of this solution are preserved. There will be no alterations made to the original formatting of the document. You will not have to deal with any difficulties in obtaining an exact and safe conversion. The tool also supports to convert OLM to any cloud-based apps like Office 365 and more.

Bottom Lines

It is possible for the need to move email to occur at any time. It all depends on the conditions in which the user finds himself or herself. In the same way, there are situations in which users require knowledge on how to convert OLM to Thunderbird. For this, you have to convert your OLM files into thunderbird.

Above, we have explained practical method that is well-suited for this type of assignment. It has the capability of converting several OLM files at the same time and importing them into Thunderbird. However, whether or not a certain solution is the best option is determine by the demands of the consumers.


By Shubham Dixit

Shubham is a distinguished subject matter expert and accomplished author with an unparalleled understanding of technology. With a deep-rooted passion for all things tech-related, Shubham brings a wealth of knowledge and expertise to their written works.