How to Open Outlook PST File in Thunderbird?

In this page Regain software have brought different ways how user can use his Outlook mail files in Mozilla Thunderbird. Before moving towards How to open Outlook file in Thunderbird let us discuss about Outlook and Thunderbird in brief.

Microsoft Outlook

Microsoft Outlook is available as part of Microsoft Office suite which is a Personal information manager. Although it is an Email application it also includes calendar, task manager, contact manager, note taking, journal, and web browsing. Microsoft Outlook is desktop based email client which is used by all big and small organization. It is most preferred email client due to its easy, secure and advance functioning.

Thunderbird Mail

Thunderbird is an application which is developed by Mozilla foundation which is desktop based email client application. Mozilla Thunderbird is an open source, cross-platform email client, news client, RSS, and chat client. Thunderbird can be used on multiple platforms like Windows, Mac, Linux, and Ubuntu operating systems. It is installed by default on Ubuntu desktop systems.


Due to the advanced functioning and rich features in Microsoft Outlook mail client its pay price is higher than other mail clients. So the users are moving towards other mail client that is reliable and cost effective. Thunderbird is one of the mail client which is most proffered by the users.

Some Reasons why users prefer moving to Thunderbird are:


Cross platform support: Mozilla Thunderbird mail client runs on multiple platforms like Windows, Mac, UNIX and Linux. It is installed by default on Ubuntu desktop systems.

Junk filtration: Filtering of junk files is quite well than other mail clients.

Multi language support: Mozilla Thunderbird client is translated into more than 50 different languages.

Ways to Import PST file in Thunderbird

  • Export Outlook To Thunderbird When Running On Same Operating System
  • Use Google Take Out To Export Outlook
  • Automated Method (Using Regain PST to MBOX Converter)

Export Outlook to Thunderbird when Running on Same Operating System

When you are running outlook and thunderbird mail clients on same system then follow the below listed steps:

i. Go to start and click on default program

ii. Go to ‘select your default program’

iii. Select Outlook from program and click on ‘set as default browser’ and click on save changes

iv. Now Run Thunderbird and in open file menu option on top then click on Tools >> Import

v. Now you can select import everything or mails and click next

vi. Next select Outlook as the file type and click next. Your files will be imported after completion click finish.

Use Google Take Out to Export Outlook PST to MBOX


i. Open Gmail account and go to Setting >> Forwarding and POP/IMAP and select Enable IMAP > Save the changes.

ii. Run Outlook and go to file menu in Top bar

iii. Click on add account now enter Username and Password of Gmail account and press Enter

iv. Create new Folder and copy & paste the required Outlook files in that folder in newly configured Gmail account

v. Now login to Gmail account and open Google Takeout

vi. Next select Mail option and deselect rest all the options from ‘select data to include

vii. Next create archive of Google and once it is created you can download the ZIP file containing the Outlook data in the MBOX file format.

viii. Once after getting the link download the Google Takeout archive by clicking on Download.

ix. After completion of download extract the Zip file to find the MBOX storing all your Gmail emails

x. At last by using Thunderbird email client import the downloaded MBOX file.

Automated Method

By using Regain Outlook PST Converter user can very easily convert PST file to MBOX/ EML which is supported by Thunderbird Email client. User can even repair their corrupt PST files using this tool. One more benefit of using this tool is that it smoothly migrate Outlook PST to multiple formats i.e. MBOX, EML, MSG, EMLX, vCal, vCard and Office 365 Platform.


Steps to be followed for converting PST files to MBOX are:

1. Install and Run Regain Outlook PST Converter on your system

2. Click on Browse to add the PST files and Click on next

4. Select the files which are to be exported and click OK

5. Take preview of the files to confirm before saving in MBOX format

6. Now from saving option select MBOX file format

8. Now after selecting the format select the location where the files are to be saved

9. Click export the process will be completed in few moments.


So, in the above page we have discussed about the methods to open the PST file in Thunderbird. 1 and 2 are the manual method for conversion which requires some technical knowledge and there may be some kind of loss of data during complete process. Therefore one of best the method which best suits to everyone and is professionally recommended is automated method / third party tool. This is because with help of the tool the files are converted in an easy, quick and secure manner without any loss of data. So for getting effective results in time effective manner go for affordable and reliable third party tool like Regain Outlook PST Converter.

Related Software: Looking for a software to Import PST files to Office 365 account or Exchange Server. Click here