Open Old OLM Files in Thunderbird for Windows by A Great Method
Tags: olmtombox, olmconverter, convertolmtombox
Published: 2023-09-26 08:10:18

Open old OLM files in Thunderbird for Windows by using the method we are going to explain in this article. In addition, we discuss why users need to transfer their old OLM files from Mac Outlook to Thunderbird Windows.
 
Many email programs are created by various companies to help them manage their tasks. Some popular email clients are Outlook, Mozilla Thunderbird, Gmail, etc. Outlook is a very popular email program used in Windows and Mac OS. Thunderbird, on the other hand, is also a free email client used on Windows, Mac, and Linux systems. Both are different with their own user bases, but still, some users are there who migrate their OLM files to Windows Thunderbird.
 
To understand this situation, we look at this query from a user: "I have upgraded my system and now use Windows. Now, all my work is done in the Thunderbird application. I used to work with Mac Outlook before upgrading, so there are some files that I want in my Thunderbird. For this reason, I am searching for a way to import my old OLM files into Windows Thunderbird." From this query, we can understand that the users want to export their old Mac Outlook data to Thunderbird on their Windows systems. Therefore, there is a method you can use to import your files.
 

## **Method to Open Old OLM Files in Thunderbird for Windows**

 
Before transferring your old files, we need to first understand a point. OLM files cannot be opened in Windows because they are made for only Mac Outlook. That’s why there is no manual way to migrate your files in the Thunderbird Windows program. However, there is a method, which is to use a third-party tool that will convert your old OLM files into MBOX file. And Thunderbird uses an MBOX file, which you can easily open. So, this is the method available that can download your old data. The method is in two parts.

1. Convert old OLM files into MBOX format.
1. Open the converted MBOX file in Thunderbird.
 
## **Convert OLM files into MBOX file using Third-party Tool**
 
The software we are going to use to export the file is free to download and has an easy-to-use interface where both technical and non-technical users can work without any difficulties. [SysTools OLM to PST Converter software](https://www.systoolsgroup.com/olm-to-pst.html) is a tool we use to convert the files. The PST file is written in the name of the software, but it exports your OLM files into various file formats like MBOX, PDF, EML, MSG, HTML, etc. In addition, it offers many other features as well.
 
### **Features of Software**
 
+ The software is made up of advanced technology that allows users to batch convert their files along with attachments.
+ You can export selected data using the date filter option.
+ When you add OLM files to the software, it automatically scans the file for any corruption issues. Later, you can save the scanned file.
+ Users can download this software in various Windows versions.
+ It provides a preview of your files before the conversion process.
 
### **Instructions to Export OLM Files in MBOX File**
 
2. Download and install the software. Go to the Add File option.
2. Open your old OLM files and click on the Add file button again.
2. After clicking it, the software starts scanning your files, and once it completes, click either the Yes or No button to save the scanned copy or not.
2. Preview your files in different modes, such as HEX, Normal View, Message Header, etc.
2. Click on the Export option to convert all the files and select MBOX format.
2. Go to the Advance Settings now and click on the Date Filter option. In From Date, choose the date you want and a date on the To Date option. Click on the Save option.
2. Now, Browse the file in your desired location, then click on Maintain Folder Hierarchy.
2. Click on Ignore System Folder to prevent unwanted files from downloading, and then Export.
 
**Note**: Before using the software, you have to first save your old OLM files in a secure place, which makes it easier to find the files.
 
So, after exporting the file, it will now be easier to open old OLM files in Thunderbird for Windows. In the next step, we import the converted MBOX file into Thunderbird. 
 
### **Import MBOX File in Windows Thunderbird**
 
There are many add-ons in Thunderbird that are free and provide facilities. Among them, an import add-on is there to import the files. You have to first download it and then you can use it. Following are the steps to download the add-on and import your MBOX file.
3. Open Thunderbird on the Windows system. Go to the Tools tab.
3. Click on Add-ons and search Import/Export Tools NG.
3. Select Add on Thunderbird, and restart Thunderbird again.
3. After this, again go to Tools and select ImportExport Tools.
3. Click on Import mbox file and select Import directly one or more mbox files. Click on OK.
3. Select a location, and then click the Open button.
 
### **Conclusion**
 
Users who want to open old OLM files in Thunderbird for Windows will easily do this after reading this article. By using the software method, the process of migrating the files becomes easier and takes less time. Because the software, in just a few minutes, converts all the files into MBOX, and then you can open it on your Windows desktop in Thunderbird.