3 Effective Methods to Migrate Thunderbird to Office 365

Summary: Thunderbird users are migrating emails into Office 365 because it has many functions like affordable, subscription-based pricing, availability, security, collaboration, and more.It allows you to take access your files anywhere and it has robust and secure cloud storage and helps to improve communication. This provides business continuity and automatic upgrades. If you are looking for the best methods to migrate Thunderbird to Office 365 and want to convert quickly. In that case, this article is only for you because we will provide the top three methods to import Email from Thunderbird to Office 365. At the end of this article, we will provide the best Thunderbird Converter tool.


Top 3 Techniques for Thunderbird to Office 365 Migration

We have many techniques to migrate Thunderbird files to Office 365. Now we will know the top three easy methods that help you to Thunderbird emails to Office 365 migration. You can easily migrate your data while using these steps.

Method 1: Migrate Thunderbird to Office 365

By using the Manual method the user can easily and simply migrate Thunderbird emails to Office 365. Let’s have a look to migrates the files with the manual method.

Step1: Save Thunderbird Emails to EML File

  • Firstly, create a New Folder on the desktop.
  • Then, Open the Thunderbird application on your computer.
  • Go to the Message Folder you want to convert and select the emails using the Ctrl+A key.
  • After selections, Right -click on the emails and choose the Save AS option.
  • Next, Browse to New Folder and save the Email there.

Step 2: Import the File to Office 365

  • Firstly, Configure your Office 365 account in Outlook.
  • Next, go to the New Email Folder that you created.
  • Now, choose the Email that you want to import.
  • Then, import your Email one by one by Drag and Drop.

Note: You can easily migrate one by one Email to Office 365 by following the above steps.

Method 2: Migrate Thunderbird to Office 365 Using Forward As Attachments

  1. Open Mozilla Thunderbird on your computer.
  2. Choose the emails you want to import to your Office 365 account.
  3. Right-tap on the selected emails and select “Forward as Attachment.”
  4. Open a new email window with the emails attached as EML files.
  5. Enter the email address where you want to migrate the Thunderbird emails.
  6. Tap to the “Send” button to send the Email.
  7. Now, go to your Office 365 Mail App.
  8. View your inbox to find the Email you sent from Thunderbird.
  9. Open the Email and click on each attached EML file individually to view the Thunderbird emails.

Note: By doing this, you can verify that the transfer process was successful by logging into Office 365 and accessing the emails through a web browser in EML format.

Limitations Migrate Thunderbird to Office 365

  • You can only migrate some folders at a time.
  • It’s a lengthy and technical method; therefore, novice users can only use it to import Thunderbird email to Office 365 easily with effort.
  • You must complete one step to migrate your pertinent data.
  • These methods can’t Migrate Email from Thunderbird to Office 365 with the original format.
  • It can be risky, lose, and corrupt your data sometimes.

Multiple methods exist to import email from Thunderbird to Office 365, but everyone wants simple and effective ways. We’ll discuss the best three strategies for Thunderbird to Office 365 migration.

Method 3: Migrate Thunderbird to Office 365 Using an Automated Technique

Many Thunderbird users want to migrate data into Office 365. Because it has various functions and advantages, some users use manual methods to import Thunderbird emails to Office 365. As we know above, manual techniques have limitations.

Therefore, it needs to be more secure to Migrate Email from Thunderbird to Office 365 which is longer. There are various methods for Thunderbird to Office 365 migration, but there are no straightforward solutions to migrate them directly.

However, many organizations prefer Thunderbird Converter Tool because it’s a short and secure solution to import Email from Thunderbird to Office 365. It has various advanced features and functions that make your task easy. It offers you multiple email clients and file formats and it also exports email from Thunderbird to Outlook. You can migrate numerous emails folder of Thunderbird to Office 365 directly by following a few steps:

  1. Firstly, Download and Launch Thunderbird Backup Tool on your system and Run.
  2. Then, Choose the Profile that you want to take backup and Next.
  3. Now, Preview the selective folders and click Next.
  4. Next, select the Office 365 option from the drop-down list.
  5. Select the Turn On Modern Authentication option and click the Sign-In button, then enter your Email Address and Password.
  6. After that, Choose the Filters and Features as per your requirements.
  7. Next, click on the Convert Option to start the process.

Also, you can download a free demo version of Thunderbird Backup Software, allowing you to download 50 emails per folder.

Advantages of Thunderbird Converter Tool

  • You can quickly transfer your Thunderbird mailbox data to popular email services like Gmail, Office 365, Yahoo Mail, AOL, Hotmail, Zoho Mail, IMAP, and iCloud. Before backing up or moving your data, you can preview it thoroughly.
  • It offers you multiple formats such as PST, EML, EMLX, MSG, PDF, CSV, JPG, TIF, HTML, MHTML, PNG, DOC, DOCX, and DOCM.
  • You can remove duplicate emails based on criteria like From, To, Bcc, Subject, and Body to avoid duplicate emails. Attachments can be saved separately as well.
  • When backing up your Thunderbird mailbox to PST, the output file can be split into smaller parts based on size.
  • You can use the Mail Filter feature if you only want to back up emails within specific dates. The backup file can be saved in one particular location of your choice.
  • You can also rename the backup files using the provided naming convention option.
  • Throughout the backup process, the tool maintains the original folder hierarchy of your Thunderbird emails.


As we discussed above, the best three techniques for Thunderbird to Office 365 migration are easy. Both methods effectively migrate Thunderbird to Office 365 manually and professionally, but you can only migrate one folder at a time using manual methods. On the other hand, the professional method is the straightforward solution to import email from Thunderbird to Office 365 using Thunderbird Converter Tool. It has various features and functions that help make your task easy. Now, it’s in your hand what method is suitable for you.

Frequently Asked Questions

Q. How do I migrate Thunderbird to Office 365 on Mac?

Ans-You can migrate Thunderbird emails to Office 365 on Mac using Mac Thunderbird Converter Tool. This application is secure and safe. You can easily use this application without any problem. This application allows you to direct migration with any size of data properly. It has various functions and features with a simple GUI. Also, beginners can convert data comfortably without any trouble. 

Q. Does this Import Thunderbird email to Office 365 with attachments?

Ans-You can Import Thunderbird emails to Office 365 with attachments using Thunderbird Backup Tool. This application is risk-free and affordable. Everyone can use this software easily without any errors. It offers you an attachment option. Besides, it has multiple features and filters that make your task easier than manual methods. 

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About The Author:

As a Technical expert, I love to write blogs on email migration, data recovery, and cloud migration. In my free time, I like to research new things related to technology.

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