How to Export Emails from Thunderbird to Office 365?

Jackson Strong | August 13th, 2022 | Mozilla Thunderbird

Learn the best way to export emails from Thunderbird to Office 365 safely. This email service provider is selected because of the security and dozens of features that help an organization to manage data.

Mozilla Thunderbird is a desktop email client. Whereas, Office 365 is a web-based business suite. Sometimes people want to stay on web and transfer all data from desktop to cloud. In this case, user wants to migrate emails from Thunderbird to Office 365 email account. This is quite a technical segment because Mozilla Thunderbird is a desktop client that can be configured with any email service provider. Transferring Thunderbird emails to Microsoft 365 can be done via loopholes. The same are discussed below.

How to Migrate Thunderbird to Office 365 Manually?

  1. Open Thunderbird and navigate to Ad On.
  2. Install the Import/Export plugin.
  3. After installing the plugin, go to Dashboard.
  4. Now click the folder that you want to import to Office 365.
  5. Navigate to Import/Export >> Export Folder.
  6. Now, name the folder to save at your desired location.
  7. Thunderbird will export the folder in .mbox file format.
  8. Restart and open Thunderbird application again.
  9. Go to Tools and then Account Settings
  10. Click Account Actions and then Add Mail Account.
  11. Enter your Name and Office 365 email credentials.
  12. Click Remember password.
  13. Enter IMAP and SMTP details and click Done.

Now Thunderbird will sync your Office 365 account. You can now import MBOX file to Thunderbird client. This time it will be saved in Office 365 mailboxes.

  • Right-click on any mailbox folders and click Import Folder >> Import messages.
  • Now import the MBOX file in Thunderbird.

Finish! This is the manual way to import mail from Thunderbird to Office 365.

How to Export Emails from Thunderbird to Office 365 Directly?

First of all download Advik Thunderbird Converter on your Windows computer. This utility will migrate from Thunderbird to Office 365 with complete emails and attachments. No matter the file size, the software is loaded with the latest algorithms that follow smooth and quick email migration.


All users can use this most reliable utility to export emails from Thunderbird to Microsoft 365 account including all email attachments. It is an automated tool that is designed for all Windows operating systems to migrate Thunderbird Mail to Office 365 in just a few simple steps that will save your time and manual effort as well. 

Steps to Migrate from Thunderbird to Office 365

1. Launch software on your Windows PC.

thunderbird to office 365 migration tool

2. Once the software detects your profile, click Next.

how to transfer emails from thunderbird to office 365

3. Select email folders and click Next button.

migrate thunderbird to microsoft 365

4. Choose Office 365 from saving option menu.

how to migrate thunderbird to microsoft 365

5. Enter your Office 365 login credentials and click Next.

export emails from thunderbird to office 365

Done! The software will start transferring emails from Thunderbird to Office 365 email account.

step 5

No other method or solution can beat this one. If you are one of the users looking for Thunderbird to Office 365 migration then you must try the above method.

Watch Video Tutorial

Why Choose Thunderbird to Office 365 Migration Tool?

There are many reasons to choose this utility and some of the best features of this tool are as follows;

  • Complete Data Migration; This tool allows users to migrate complete mailbox Thunderbird emails to Office 365 accounts such as Inbox, Sent Mails, Outbox, Draft, Spam, Trash, and any other email folders created by users.
  • Maintain Folder Structure; The Folder Structure of email remains the same during the process of migration. This helps users to navigate their emails easily even after the process of conversion.
  • Include Attachment Files; Attachment plays a very important role in email messages. That’s why our tool is designed to include the attachments in their respective emails.
  • Transfer Thunderbird to Outlook: With this tool, users can also import Thunderbird to Outlook, Gmail, Yahoo Mail, Apple Mail,, Zoho Mail, Rackspace, AOL Mail, iCloud, GoDaddy, etc.
  • Retain Key Elements; All the key elements of email remain the same such as ‘to’, ‘from’, ‘Cc’, ‘Bcc’, ‘Hyperlinks’, ‘Unicode Text’, ‘Embed Images’, etc.
  • Multiple Output Formats; Apart from Thunderbird to Office 365 migration, you can use this software to export Thunderbird emails to PST, MSG EML, EMLX, PDF, etc.
  • Free Demo Download; You can download this application for free to check the efficiency of the tool. Hit the button below to download this software for free.


You have two easy methods that will lead to Thunderbird to Office 365 migration. You can select any suitable solution to export all emails from Thunderbird to Office 365 account. Both methods had been practically executed. However, the manual method had some complexity. Whereas, the professional approach is the better choice to migrate, copy, transfer, and convert Thunderbird to Microsoft 365.