How to Migrate Thunderbird Contacts to Office 365?

Introduction: In this blog, we will learn about the best method to migrate Thunderbird Contacts to Office 365 by using the powerful tool that is Thunderbird Address Book Converter. Also you will get to know about the manual way to extract contacts from Thunderbird to Office 365.

Nowadays, many users depend on emails for our businesses. And for this we use different email platforms. And Mozilla Thunderbird is one of the most preferred email client across the world. Thunderbird is an email platform that can store users’ emails, attachments, address book, calendar, notes, etc. But sometimes, users need to migrate Thunderbird Address Book to Office 365. And, if you are also looking for a reliable and effortless solution on how to extract contacts from Thunderbird to Office 365, then read this blog till the end.

Methods to Migrate Thunderbird Contacts to Office 365

  1. Automated Solution
  2. The Manual Method

Best Approach to Extract Contacts from Thunderbird to Office 365

Thunderbird Contacts Converter tool is the perfect solution for importing address book from Thunderbird to Office 365. This is the preferred and most efficient solution for users as it is an error-free strategy and accurate results can be achieved in a short time. The software recommended here can also help you export Thunderbird Address Book to CSV/vCard/PST.

Before getting into the steps, first download the tool for free by clicking the below button.

Steps to Migrate Thunderbird Contacts to Office 365 are as follows:

Step 1. Download and Run Thunderbird Address Book Converter in your PC.

Step 2. Add Thunderbird files having contacts using Browse option.

Step 3. Now, preview the files and select the Export option as CSV.

Step 4. Finally, hit the Export button to start the process.

So, you have seen that how to extract Thunderbird address book to Office 365 using the best Thunderbird Contacts Converter.

Manual Way to Export Thunderbird Address Book to O365

This method includes two steps; 1) Export Thunderbird Contacts as CSV format, 2) Import CSV file to Office 365

Let see how to migrate contacts from Thunderbird to O365 in detail.

Export Thunderbird Contacts as CSV format

  1. Launch and Open Thunderbird application and Select Address Book option from there.
  2. Then go to Tools >> Export and select CSV option to Save the files.

Import CSV to Office 365

  1. Open Office 365 account and Select Outlook.
  2. Select the Gear icon and go to People >> Import Contacts.
  3. Lastly, click the Browse button to add the extracted CSV files and hit the Import button.

Why Yota Thunderbird Address Book Migrator is best?

  1. There is no need to install any other app to migrate Thunderbird contacts to Office 365.
  2. The user interface is so simple that anyone can operate the tool without any issue.
  3. Also, users will get the feature to convert Thunderbird contacts to CSV, VCF or PST file formats.
  4. There is no file size limitation imposed on the tool that means user can migrate unlimited number of contacts from Thunderbird to Office 365.

Prime Features of Thunderbird Address Book Converter tool

 Thunderbird Address Book Converter can convert Thunderbird contacts to multiple file formats like CSV, VCF or vCard and PST formats.

Free preview of the uploaded files is available as soon as the Thunderbird address book will be added to the software panel. User will get all the important details like name, contact number, office address, email id, fax number, etc.

Thunderbird Contacts Converter gives the user two different options to add the contacts files. One is Add Files and other Add Folder. If user want to add only single file, then he will click on Add File option but if he has bulk files then he should click on Add Folder option to upload the complete folder.

If users want to merge contact data from multiple Thunderbird address books, they can do so with Thunderbird Address Book Converter. This application can combine a large number of data into a single file in CSV, PST and VCF formats.

Limitations of the manual method:

The process is very long and Complex as compared to the automated solution.

You need to have Mozilla Thunderbird installed on your system for this method to work. While with the automated solution, there is no need to install Thunderbird.

There are more chances to get the corrupt file as a result.


In this article, you learned about two ways to migrate Thunderbird contacts to Office 365. You may go with the manual method but it is not useful if you have multiple files and you want to export all Thunderbird contacts to Office 365. But, the above recommended application offers several other options besides bulk conversion. Using this tool, you will be able to migrate Thunderbird contacts to PST, VCF or vCard format which can be then import to many other email clients. Also, the tool is really safe and error-free and you will get 100% accurate results.

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