Most Popular Ways to Import OST file into Thunderbird

Summary:- With the help of this blog, you can find the best and most secure ways to import OST file into Thunderbird. There are several approaches to converting OST to MBOX. You can use the manual method as well as opt for the automated solution that consists of the best OST to PST Converter. Go through this blog to understand and choose any approach at your ease and convenience to import OST to Thunderbird.

Although Outlook is a well-known email client used by huge organizations and many individuals, if you are a regular user of MS Outlook, you know the problems users have to face. Outlook users can save their data in only Outlook Data File (.pst) format. Indeed PST files are one of the best file formats. But PST files only work for Outlook and do not support Mac OS and Linux. So to access PST file data other than Outlook, users convert PST to MBOX. Cause MBOX supports many email clients, unlike PST files which include Thunderbird, Apple Mail, Power Mail, Entourage, Eudora, Postbox, Mulberry, Sparrow, etc.

There are two approaches by which you can import OST files to Thunderbird that are manual and professional. Firstly we are describing the manual method to open OST file in Thunderbird.

How to Import OST File in Thunderbird Manually

To import OST files into the MBOX file format, you need to change the OST files into PST first, then convert the PST file into MBOX to open it on Thunderbird. It’s a lengthy process and takes patience to perform so let’s get started.
Two major steps to import OST to Thunderbird

  1. Export OST files to PST file format
  2. Import the exported PST file into MBOX

(Note:- Manually there is no direct method to import the OST file into Thunderbird.)

1. Steps to Convert OST to PST

  • Run MS Outlook on your system.
  • Go to File >> Open & Export >> Import/Export.
  • Select the Export to a file option and hit the Next button.
  • Now, choose Outlook Data File(.pst) and click Next.
  • Pick the folder(s) you want to export from the mailbox, then tap on the Next button.
  • Finally, Browse and choose a destination for your PST folder and hit the Finish button to start the saving process.

2. Steps to Import PST file to Thunderbird

  • First, make sure Outlook is your default setting for sending and receiving email by clicking on the Default Programs >> Set your default programs, then choose Outlook.
  • Now, run Thunderbird, then go to the Thunderbird Menu option.
  • Open the Tools menu and select Import.
  • Here, click on the Mail option and hit the Next Button.
  • Select Outlook as your saving folder and click Next.
  • Finally, hit the Finish button to end the import process.

By following the above instructions you can successfully import OST file into Thunderbird. However, this approach is quite lengthy and time-consuming and also consists of many disadvantages. As some of its demerits are mentioned below.

Limitations of Manual Method

  • Users cannot convert OST to MBOX directly as it takes lots of steps to complete the whole process.
  • To perform the manual method, users need to have technical expertise, thus it’s not suitable for non-technical people.
  • This approach has a high chance of data loss due to mishappenings like connection loss and internal bugs and viruses.

To avoid these problems we are suggesting you use the professional approach to open OST file in thunderbird. This method is 100% reliable and strongly recommended by professionals. So continue to know more about the automated way that can import your OST files into Thunderbird in one go.

Automated Solution to Import OST File into Thunderbird

OST to PST Converter is the ultimate tool to import OST to thunderbird. This software provides many benefits to its users in terms of effectiveness and efficiency. It allows users to convert OST files into many file formats like MBOX, PST, DBX, MSG, EML, etc. You can import OST files to Microsoft Exchange Server, Office 365, IMAP Server, Gmail, Outlook Web (OWA), Thunderbird, OperaMail, and other cloud-based email clients. It can also convert the encrypted OST files without any complications and supports all versions of Window OS. Now, let’s see its simple procedure to import OST file to Thunderbird.

Steps to import OST file into Thunderbird

  1. Install OST to PST Converter and Run it on your system.
  2. Add the OST file(s) you want to export by clicking on the Browse option.
  3. Take a Preview of emails of your selected OST file and choose the emails that you want to import to Thunderbird.
  4. Hit the Next button and select the MBOX file format from the drop-down menu in the Save As option.
  5. Click on the Path to Save button to assign the location of your resultant file.
  6. Finally, hit the Convert button to start the conversion process.

By following the above instructions you can easily import OST file into Thunderbird. It’s the most reliable and secure way to open OST file in Thunderbird without any hassle.


In the above context, we have discussed the manual and professional manner to convert OST to MBOX. Where the manual method had some disadvantages and on the other hand automated solution is more effective and efficient. However, you can opt for any of the prescribed methods. But we are suggesting you use the professional approach to import OST file into Thunderbird. You can also try its free version to export files in bulk.

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