How to Import Outlook Contacts to Thunderbird? Easy Methods

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  • Updated on September 11th, 2025

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To stay productive in an open-source environment, the user decides to switch from Windows to Linux. Outlook isn’t supported in Linux. Therefore, the user chose to import Outlook contacts to Thunderbird email client. This blog will let you know how to import contacts to Thunderbird. We have outlined the entire process step-by-step with all the information you need. Also, there is a reliable tool, Cigati PST Converter, that we’ll talk about in detail. Follow along with ease.

Need to Import PST Contacts into Thunderbird

There are several advantages of importing Outlook’s contact data into the Thunderbird email client. Here’s why the users make this migration:

  • Highly Customizable: Enhance and personalize the email experience in Thunderbird with add-ons and extensions.
  • Works Everywhere: Compatible with all the major platforms, like Windows, macOS, and Linux.
  • Multiple Saving Options: Thunderbird saves the data in universally compatible formats, MBOX and EML.
  • Free to Use: Thunderbird email client is free, unlike Outlook, which requires a paid subscription. 
  • Privacy and Security: With strong security features like phishing protection, encryption support, etc.

Manual Method to Import Contacts from Outlook to Thunderbird

Here, you’ll find a detailed explanation for moving your Outlook PST contacts to Thunderbird. Let us first begin with the manual methods followed by a professional tool.

Follow the step-by-step process to begin the migration process:

Step 1: Export Contacts from MS Outlook 

  1. To begin with, open the Outlook application on your computer.
  2. Then, head to File > Open & Export > Import/Export > Export to a file.
  3. Next, click on Comma-Separated Value (CSV) as the file extension and hit Next.
  4. Now, choose the Contacts folder that you wish to export.
  5. Click on the Browse button to store the resultant file and then hit the Finish button. 

Step 2: Migrate Outlook Contacts to Thunderbird Address Book

  1. First, open the Mozilla Thunderbird application.
  2. Go to the Address Book or Contacts.
  3. Then, head to the Menu and click on Tools > Import.
  4. Now, select the desired Address Books or Contacts and click Next.
  5. After that, choose CSV as the format and press Next.
  6. Next, locate and select the exported CSV file.
  7. In the Field Mapping window, match the fields and hit the Ok button. 

Shortcomings of the Manual Method

  • If the fields are not matched properly, there can be a mismatch or empty fields in Thunderbird.
  • Also, exporting and importing hundreds of contacts may consume a lot of your time.
  • Moreover, it is a one-time transfer process. To further add the new contacts, you need to follow the whole process.
  • Lastly, if your Outlook profile is corrupted, this manual method will not work.

An Expert Solution to Import Outlook Contacts to Thunderbird

Import Outlook PST contacts to Thunderbird in bulk with the trusted Cigati PST Converter. Not only Thunderbird, but it also exports to other popular email platforms like Gmail, Hotmail, etc. Besides this, it quickly converts Outlook PST contacts to several file formats, ensuring maximum compatibility. Also, the software saves users’ time with bulk conversion, smart filter options, and duplicate email detection and removal. Plus, with an inbuilt preview option, users can verify their data before executing the conversion process.

To proceed with the automated tool steps, you need to first download the Outlook contacts locally. Follow the mentioned steps:

  1. First, open Outlook > File > Open & Export > Import/Export.
  2. Then, Export to a file > Outlook Data File (.pst) > Next.
  3. Choose the desired Contacts to be imported.
  4. Next, save the file at the preferred location and click Finish > Ok.

After downloading the PST contacts file, follow the step-by-step process:

  1. Download and launch the conversion software.
  2. Then, choose either Single File Mode or Batch Mode and click Next.
  3. After that, click on the Select Files option to add the downloaded PST contacts file.
  4. Now, select the specific contact(s) and click Next again.
  5. Afterward, pick VCF as the target output File Format.
  6. Apply the optional filters and hit the Convert button.

Conclusion

This technical blog discussed the needs that users consider when switching from Outlook to Thunderbird. It also details how users import Outlook contacts to Thunderbird using an expert automated solution. Moreover, we have also explained a manual approach for those who want to import only a few contacts. The user can now choose from both approaches according to their requirements.

You May Also Read: Transfer Outlook Contacts to iCloud

Frequently Asked Questions

Q: Which file formats are supported for importing Outlook contacts into Thunderbird?

Ans: The Thunderbird email client supports importing contacts from CSV and VCF files only. The Outlook PST contacts must be exported in one of these formats first and then imported to Thunderbird.

Q: Are there any automated tools for transferring Outlook contacts to Thunderbird?

Ans: Yes. The Cigati PST Converter can simplify the process by directly converting PST contacts to Thunderbird-compatible formats. But, before the conversion steps, you need to download the Outlook contacts PST file.

About The Author:

Rohit Singh is an Email Backup, Recovery & Migration Consultant and is associated with Software Company from the last 3 years. He writes technical updates and their features related to MS Outlook, Exchange Server, Office 365, and many other Email Clients & Servers.

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