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Move Thunderbird Mailbox to Microsoft 365 Step by Step

With Microsoft offering cloud services on a monthly basis, many organizations have decided to migrate to Microsoft 365. It provides more secure communication and better document collaboration in real time. Many administrators are looking for a solution to Move Thunderbird Mailbox to Microsoft 365. This is an excellent platform that offers the benefits of an online Exchange server and email that can be accessed through a browser. This article aims to meet the needs of businesses and home users. Read the following post to learn more about this topic.

Therefore, before we further discuss the different solutions for importing Thunderbird MBOX files into Microsoft 365 accounts, let’s briefly discuss the main reasons for the migration process.

Reasons to Move emails from Thunderbird to Microsoft 365

Here are some reasons to use O365 to migrate from Mozilla Thunderbird to Microsoft cloud services:

  • Provide additional functions for data sharing, archiving, communication and collaboration.
  • Migrate or move Thunderbird Mail to Microsoft 365 to rent Microsoft cloud services on a monthly basis.
  • Enhanced security and data storage benefits via the O365 cloud server.
  • Provide unique subscription packages for each organization based on size and requirements.
  • Export from Thunderbird to Microsoft 365 to read emails via browser on any mobile device or tablet.
  • Get unlimited Office applications, such as Word, Excel, Access, Skype, Exchange Server, etc.

Also Read: How to Convert MBOX to PST Manually

How to Move mail from Thunderbird to Microsoft 365

Here are some reasons to use Microsoft 365 to transfer mailbox information to Microsoft cloud servers:

Solution 1: Import EML files into Microsoft 365

Step 1: Save Thunderbird emails on Windows PC

  1. First, create a new folder on the desktop.
  2. Next, launch the Thunderbird application on the system.
  3. Next, open the message folder where the emails to be moved from Thunderbird to MS Outlook are saved.
  4. Then, use Ctrl + A to select all messages.
  5. Then, right-click on the message and select the Save as option.
  6. Then, go to the desktop folder and save the email there.

Step 2: Import EML into Microsoft 365

  1. First, start the Outlook email application.
  2. Then, go to the folder in Outlook where Thunderbird messages will be saved.
  3. Alternatively, select the Folder tab and select the New Folder option.
  4. In the New Folder dialog box, set the name of the new folder.
  5. Then click the OK button to Move Thunderbird Mailbox to Microsoft 365.
  6. The folder will now be displayed in the left panel of the email application.
  7. Then, click on the folder to open its contents in the center panel.
  8. Finally, drag all messages from the Desktop folder to this folder in Outlook.

Solution 2: Forward as an attachment

  1. First, open Mozilla Thunderbird on your Windows PC.
  2. Next, select the messages that need to be imported from Thunderbird to your Microsoft 365 account.
  3. Then, right-click on them and select Forward as attachment.
  4. A new email window will open where the email is added as an EML attachment.
  5. Next, enter the email ID to migrate Thunderbird to Microsoft 365.
  6. Then click the Submit button.
  7. Finally, check the Thunderbird email on the Microsoft 365 mail app.
  8. Verify the transfer process by logging into O365 and opening one email at a time via a browser in EML format.

Restriction: Manually Move Thunderbird Mailbox to Microsoft 365

  • Limited to certain emails: Thunderbird’s email transfer process to Exchange Online doesn’t mean moving a full email folder containing more than 1,000 emails.
  • Long process – It may take a long time to move each email to desktop once and then to Microsoft 365 Outlook.
  • Time-consuming: Forwarding hundreds of Thunderbird emails with large attached files to Microsoft 365 can be time-consuming.
  • Damaged Data Integrity: The email format or SMTP headers of some emails are often changed during transmission.

Solution 3: Use an automated solution

Typically, the manual solution for migrating Thunderbird email to Microsoft 365 may not be the preferred method used by organizations. Many companies are looking for a professional solution to migrate multiple mailboxes at the same time. They are looking for third party software solutions that help them easily export Thunderbird messages to Microsoft 365.

MBOX to Microsoft 365 Migrator is such a reliable and efficient tool to migrate MBOX to Office 365. It is best suited for large companies planning to migrate their IT infrastructure to the O365 cloud. It can transfer complete email folders without losing data or affecting data integrity in any way.

  • Step 1: Add Thunderbird MBOX file to the software
  • Step 2: Choose whether to keep the folder hierarchy.
  • Step 3: Use impersonation (if you have an administrator ID) or enter your normal user credentials (if impersonation is not used).
  • Step 4: Apply the filter and click Export to start the migration process.

In short

Microsoft’s cloud technology is sought after by many large and small businesses. Provides all Office suite applications including Exchange Online Server and low cost Outlook 365 mail application. This allows businesses to import or Move Thunderbird Mailbox to Microsoft 365. This article describes a long and tedious manual way to migrate multiple mailboxes in days. It also describes an appropriate automation solution that allows the administrator to complete the entire task more easily.

Stephen Renald
A technologist who writes about ways to get things done using technology

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