When you deal with a migration like Thunderbird to Office 365 or Exchange Online one thing that comes to your mind is “Which method is safer and easier?”. Don't worry, here I am going to share both a quick path to manual conversion and a third-party solution to import Thunderbird emails to Microsoft 365 account.

But I also warn you that the manual method is huge and you need technical skills to do it.

Quick path to export Thunderbird data to Office 365

First export or convert Thunderbird emails to Outlook PST format. To get PST files from Mozilla Thunderbird, you can also use manual and third-party tools.

Manually: 

1. Configure Thunderbird account in Gmail using IMAP protocol

2. After setting up the account > create a new folder under Account, then drag and drop the Thunderbird email into the new folder.

3. After that, the mailbox is automatically synced with Gmail.

4. Now open Microsoft Outlook and create a new account with the same Gmail account. And wait for all mailboxes to sync to Outlook.

5. In the last step, go to File > Press Import-Export option to export Outlook files to PST format.

With third-party tools:

1. Download and install MailsDaddy Thunderbird to Outlook Converter and run the program.

2. Click the Add File button, then press Auto Load and add Thunderbird email to the software.

3. Press the Export button > Select PST file for Outlook, then enable a conversion option "Single or separate PST file for all MBOX".

4. Browse to the location to save the MBOX file, then press the Export button to start the migration.

Once you get the PST file from Thunderbird, follow the network upload method to import Thunderbird emails to Office 365 environment.

How to transfer Thunderbird emails directly to Office 365?

MailsDaddy has also developed a Thunderbird to Office 365 migration tool to upload Thunderbird emails to the Office 365 platform in a few simple clicks. This GUI solution is integrated with various advanced features to import data into Microsoft 365 primary and in-place archive mailboxes.

Steps to export Thunderbird mailbox to Office 365

1. Download and install the software in Windows OS.

2. Run the program and click the Auto button to add the mailbox.

3. Press the Export button > Select O365 export format

4. Select primary and in-place archive options. The folder name is an optional option.

5. Press the Next button and type: Client ID, Tenant ID Secret value, and User ID, then the Export button to start the migration.

That’s it.

Conclusion

 Here I have shared all the steps of the export method to transfer Thunderbird emails to Office 365 account. The manual method is a technical skill method with the help of which you can upload one by one per mailbox. But to save time, we recommend you choose the automated method which is known to convert and organize your mailbox. The free version lets you migrate some emails for free. You can also take the help of customer care for more convenience.

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