How to Migrate Contacts from Thunderbird to MS Outlook?

Thunderbird is a popular email client developed by Mozilla Foundation. It is an open-source email client including emails, address book, calendars etc. In Thunderbird, emails are saved in MBOX file format but the Address Book is in .mab file extension. Since MAB file is supported by other Mozilla email applications like Netscape, SeaMonkey etc. but cannot be imported directly to MS Outlook. Therefore, it becomes mandatory to export Thunderbird Address contacts to MS Outlook. In this given article, the whole procedure to import Thunderbird contacts to Outlook is discussed.

Importing Thunderbird Address Book into Outlook

Migrating Thunderbird contacts to Outlook process is divided basically into two stages –

  • Migrate Thunderbird Contacts to CSV
  • Import CSV file in MS Outlook

Step 1. Steps to migrate Thunderbird contacts to CSV format

First, we will export contacts of Thunderbird into CSV format. Let us discuss the steps to convert Thunderbird Address Book to CSV format. Here are the steps –

1. Open Thunderbird application on your system and go to the Address Bookoption from the menu bar.

go to address book

2. This will open Address Book Window on the screen. After that, select the Address Bookwhich you want to move from Thunderbird to MS Outlook.

Select address book

3. Now, click on Toolsoption and choose the Exportoption.

choose export

4. Specify a location to save the address book. Provide a file name and choose CSV file format in Save As type. Click on Save.

location to save

Step 2. Steps to import CSV file in MS Outlook

Now, after exporting Thunderbird Address Book contacts to MS Outlook. You need to import Comma Separated Value (CSV) file in Microsoft Outlook. Get the steps to import CSV file in MS Outlook 2019, 2016, 2007, 2003 and others –

1. First of all, open Microsoft OutlookProgram on your system

2. Go to Filemenu, now choose Open & ExportOption. Click on Import/ExportOption

3. Import and Export Wizard opens, choose Import from another program or fileoption and press Nextbutton

import or export

4. Next, you need to choose Comma Separated Values (Windows)and then, click on the Nextbutton.

select file type

5. Browse CSV filethat you have exported from Mozilla Thunderbird. Choose the radio button Do not Import Duplicate Itemsand click on the Nextbutton.

file import

6. Select the desired folderwhere you need to import contacts and click on contacts and then, click on the Nextbutton. It is recommended to choose Contactsfolders as it is intended to store contacts. However, you can choose any other folder as per your choice

desired folder

7. Under Import a fileWindows, click on the Finish Button. Wait for the contacts to move from Thunderbird to Outlook.

import file

8. Press Map Custom Fieldsand you can map the contacts. Click Ok.

map custom fields

9. Now simply, click on the FinishButton.

click finish

10. Finally, importing Thunderbird contacts to Outlook process gets started. The progress is shown in the image below –

import and export


The article focuses on migrating Thunderbird Address Book to Outlook in Windows OS. If you are a Mac user, you need to export Thunderbird to CSV in Mac machine and copy the CSV file to Windows OS to import into MS Outlook any edition. We have completed defined the process to transfer Thunderbird contacts to MS Outlook for Windows users. This will guide properly to the users to execute the process.

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