How to Open PST File in Thunderbird With & Without Outlook?
Thunderbird cannot open PST files directly. It store mail in MBOX, EML and Maildir format while Outlook uses PST. To import PST to Thunderbird, you have three working options:
- Thunderbird built-in import feature. It is free but requires Outlook Classic installed running and matching Thunderbird bit version.
- Convert PST file into a Thunderbird-compatible format i.e. MBOX and then import with ImportExportTools NG. It is free and no Outlook installation required.
- A professional software that can directly import, no Outlook and add-on required.
This informative article explores complete, detailed instructions to open PST file in Thunderbird. Here, we will figure out 3 easy and quick solutions to accomplish this task.
Table of Contents
- Real PST to Thunderbird Migration Case
- Common Reasons to Import PST to Thunderbird
- Can Thunderbird Import PST File
- Before You Start: Requirement Checklist
- Method 1. Open PST File in Thunderbird Using Outlook
- Method 2. Convert PST into MBOX and Use ImportExportTools NG
- Method 3. Convert PST to Thunderbird Using Professional Solution
- Watch How to Import PST to Thunderbird Without Outlook
- Manual vs Automated Method Comparison: Which Method Should You Choose?
- Conclusion
- FAQs
Real PST to Thunderbird Migration Case
While going through solutions to transfer PST emails into Thunderbird, I came across a discussion on Reddit where a Thunderbird user wanted to import it’s old Outlook PST data into Thunderbird’s Local Folders.
The user had a PST file with years of emails collected in it and wanted to access them directly from Thunderbird without uploading all data to an email server via IMAP. His main concern was to store all emails on local computer so that he can access them in Thunderbird.
This is actually a common need. Many users have old Outlook archive files with important data such as emails, invoices, project discussions and personal records. They don’t want to keep Outlook installed just to access those archives, but want to transfer data into Thunderbird and store it locally.
The problem is that Thunderbird doesn’t support PST files. Users will have to use Outlook based import methods or convert the PST data into a compatible format that Thunderbird supports so that it can access it in Thunderbird Local Folders.
If you also need solution for the similar query then the ways described in this blog will help you do this.
Reasons to Import PST to Thunderbird
Here are some common reasons why users want to open PST file in Thunderbird:
- Free and Open-Source: To avoid Outlook licensing costs and use Thunderbird’s free & open-source environment.
- Cross Platform Compatibility: Thunderbird is compatible with all major platforms, including Windows, Mac and Linux. So, users can use the same email client on all of their devices.
- Search Option: Thunderbird has a powerful search engine that can be used to find emails easily.
- Add-ons: It has a wide range of add-ons that can be used to customize the email experience.
Can Thunderbird Import PST Files?
No, Thunderbird cannot open PST files directly because it is a file format created by Microsoft Outlook. Thunderbird mainly supports MBOX, EML and Maildir. Outlook stores mailbox data in PST and OST. So, the difference of file formats makes it impossible to import directly.
However, you can use alternative methods to import Outlook data files. Here, we will discuss two manual and one professional approach to do it.
Before You Start: Requirement Checklist
Check these before choosing a method. Getting this wrong is the cause of most failed imports.
| Requirement | Method 1 (Outlook) | Method 2 (MBOX) | Method 3 (Converter) |
|---|---|---|---|
| Outlook Classic Installed | Required | Not Needed | Not Needed |
| Works with New Outlook | No | Yes | Yes |
| Matching 32/64-bit Builds | Required | No | No |
| Outlook Set as Default Mail App | Required | No | No |
| Thunderbird Add-on Needed | No | Yes | No |
| Internet Connection | No | No | No |
Method 1. Open PST File in Thunderbird Using Outlook
Thunderbird has an inbuilt option to import from Outlook. But in this approach, first you need to move PST file into Outlook. After that, you can import emails from Outlook to Thunderbird.
Requirements: Outlook Classic installed, same bit version as Thunderbird, Outlook set as default mail client and Outlook closed during import.
How to check your bit versions:
- Outlook Classic: File -> Office Account -> About Outlook. The version string ends in 32-bit or 64-bit.
- Thunderbird: Menu -> Help -> About Thunderbird.
If they do not match, then Method 1 will fail. Either reinstall one to match or use method 2/3.
Step 1. Attach PST File to Outlook Profile
Thunderbird can only see mail that is loaded in your Outlook profile. So, first open the PST in Outlook.
Launch Outlook Classic.
- Go to File >> Open & Export >> Open Outlook Data File.
- Browse your .pst file and click OK.
- Now, confirm the PST folders appear in the Outlook left-hand folder pane.
Step 2. Set Outlook as the Default Mail Client
- Open the Control Panel and navigate to Programs.
- Click Default Programs >> Set your default programs.
- Select Outlook and click Set this program as default, and then press OK.
Step 3. Run the Thunderbird Import Wizard
- Close Outlook completely and open Thunderbird.
- Click on Tools tab and choose Import.
- Select Import from Outlook and click Continue.
- Choose what you want to import i.e. Mail, address books or settings.
- Now, your imported folders is shown in Local Folders.
Limitations of this Approach
- It imports the entire Outlook profile. you cannot choose individual PST file to import.
- Outlook Classic is mandatory.
- Folder hierarchy is not preserved.
Method 2. Convert PST into MBOX and Import with ImportExportTools NG
Thunderbird’s native format is MBOX, so converting the file removes the Outlook dependency completely. After conversion, you can import the exported MBOX file using ImportExportTools NG.
- Export PST file into MBOX using PST to MBOX Converter.
- Now, open Thunderbird on your system.
- Go to the 3-line menu icon and click on Add-Ons and Themes.
- Search for ImportExportTools NG.
- Click on + Add to Thunderbird and restart it.
- Next, right-click on Local Folders and choose ImportExportTools NG >> Import MBOX File.
- Browse converted .mbox files and click Open button.
Your PST folders now appear under Local Folders.
Method 3. Convert PST to Thunderbird Without Outlook
In the manual methods, most of the users will face some issues while importing data from PST file to Thunderbird. So the need for a better solution must be considered. To fill that gap, we are here introducing Advik PST Converter. The software is able to directly upload Outlook data file to Thunderbird without any external installation. The tool offers several advanced features such as bulk importing, preserving data integrity & folder hierarchy, advanced email filters, etc. to make the process simple and effective.
Click on the FREE download button and analyze its working process at no cost.
Steps to Import PST File in Thunderbird
1. Run the tool and click on Select Files or Folders to add .pst file.
2. Choose the required mailbox folders and click Next.
3. Select Thunderbird as a saving option.
4. Next, click the Convert button and analyze the importing process.
This is the complete step-by-step process for importing PST emails into Thunderbird. After completing the process, you can access your PST data in any version of Thunderbird.
Watch How to Import PST to Thunderbird Without Outlook?
Manual vs Automated Method Comparison: Which Method Should You Choose?
td>DifficultYes
| Feature | Import Using Outlook | Open via ImportExportTools NG (Conversion) | Advik PST Converter |
|---|---|---|---|
| Outlook Installation Required | Yes | No | No |
| Add-ons Required | No | Yes | No |
| Technical Knowledge Needed | High | Medium | Low |
| Number of Steps | Multiple | Multiple | Few |
| Bulk PST Import | No | Limited | Yes |
| Large PST File Support | Difficult | Difficult | Yes |
| Time Required | Takes some time for large files | Medium | Comparatively less |
| Preserve Email Formatting | Limited | Limited | Yes |
Conclusion
In this post, we have discussed how to import PST to Thunderbird. After knowing the fact that Mozilla Thunderbird does not have the option to import PST files, we found a loophole. The manual tricks are 100% workable in the older version of Thunderbird. It may or may not work in the latest edition due to various technical changes. If they work, then it’s great. Otherwise, you can opt for the professional automated software. You will be able to save your manual efforts and time and get the results accurately.
Frequently Asked Questions
Q 1. Will this software work to import Outlook PST file to Thunderbird on Windows 11?
Ans. Yes, this application works on all Windows versions, including Windows 11.
Q 2. How can I test the software before purchasing it?
Ans. You can take a trial of the PST to Thunderbird converter free, which allows you to transfer 25 PST emails into a Thunderbird profile. If you are satisfied with its woking procedure then you can purchase the licensed edition.
Q3. Can Thunderbird open PST files directly?
Ans. No, Thunderbird can’t import PST files directly. You’ll need to use automated software or convert PST to MBOX which is a compatible format of Thunderbird.
Q4. Does it maintain attachments while importing PST files to Thunderbird?
Ans. Yes, this product maintains all email attachments and other components during the process.
Q5. Does it allow to move of large-sized PST files to Thunderbird application?
Ans. Yes, there is no size limitation and it is lab-tested software with large-size PST files so don’t worry.
Q6. Is Outlook installation mandatory?
Ans. If you use the manual method then Outlook installation is mandatory while the software works without Outlook.