How Do I Transfer Emails From Thunderbird to Office 365?

Bhawna Barwal | email conversion file conversion software technology | 4 minutes read | Last updated on May 24th, 2025,

Introduction

Looking for how do I transfer emails from Thunderbird to Office 365? Then you are going to explore the best solutions of it, in this blog. Thunderbird program is a desktop based email client while Office 365 is web based email service provider. Office 365 is an appropriable choice for the large business organization. Also, Office 365 comes with beneficial apps such as Excel, Outlook, PowerPoint, Word, etc. So, if you want to grab facility of Office 365 by accessing Thunderbird data in Office 365. Then you should follow this article till the end. Here, I will elaborate on one manual approach and a professional Thunderbird to Office 365 Converter.

Hello I am Martina, I have a need to open/access Thunderbird email client data in Office 365. How can I transfer such huge data from Thunderbird to Office 365? I know it may not be feasible with manual method. Please suggest me a safe & secure software. Thanks.

How Do I Transfer Emails From Thunderbird to Office 365 Manually?

  1. Run your Thunderbird email program on your PC.
  2. Now simply go to Tools and select Account Settings option.
  3. Go to Account Action, thereafter select Add Mail Account.
  4. Now you need to fill all Office 365 login details.
  5. Also, provide server detail information of Office 365.
  6. Lastly, press on the “Done” and click on the Finish button.
  7. Now you have connected to your account.
  8. Press right click on the required folder that contains emails.
  9. Now, select “Move to” and also select Office 365 account.

Above provided manual method has some limitations like, it can transfer data of emails only not calendar, and contacts. And Thunderbird email client installation is mandatory for this. Users can encounter certain errors while transferring Thunderbird email files to Office 365 manually. No doubt it is a lengthy process to convert/transfer emails from Thunderbird to Office 365 manually.

The Finest Thunderbird to Office 365 Tool to Transfer Email from Thunderbird to Office 365

BitData Migration Thunderbird ConverterThe best solution for transferring emails from Thunderbird to Office 365. This software gives convenience to select/upload files as per preferences. And it is very easy to choose the files according to the requirements. There are options like convert default email from Thunderbird profile automatically. And also, it is feasible to choose various files manually, hence option for uploading multiple files one by one is possible. And, one can also upload or select the whole folder into the software at once. This app allows migrating Thunderbird based files like SBD, No Extension, MBOX, EML, etc.

Users can overlook the selected just before the conversion. Let me also ensure you this method is safe and secure, as it retains the exactness of Thunderbird email files as it is, such as email content, date, meta elements, office 365, etc. And, it is capable and sufficient to convert Thunderbird email files to Office 365 independently without the support of Thunderbird email client. Download free demo edition of the Thunderbird to Office 365 Tool that offers to transfer 25 Thunderbird email files to Office 365 completely free of cost.

How Do I Transfer Emails From Thunderbird to Office 365? – Working Steps

Follow few simple steps mentioned below in order to migrate data from Thunderbird to Office 365:

Step1: Install Thunderbird to Office 365 Tool on your system.

Step2: Now choose required option to upload Thunderbird data for the migration like convert default configured Thunderbird mailboxes, and let me select email files of Thunderbird that are saved separately.

Step3: You also have option to load files as well as folder.

Step4: Now preview all selected files before the migration from Thunderbird to Office 365. Move further clicking Ok button.

Step5: Choose the desired saving option like Office 365. Now enter login credentials of Office 365 account.

Step6: Hit the Export button to start the migration procedure.

Read more:

How to Transfer Emails from Thunderbird to Outlook

How Do I Convert Thunderbird Files to PDF Document

Frequently Asked Questions

Can I convert Thunderbird based file MBOX files to Office 365?

Answer: Yes, you can transfer Thunderbird supported files of MBOX to Office 365 with using this Thunderbird to Office 365 Converter.

In which OS I can install Thunderbird to Office 365 Converter?

Answer: Thunderbird to Office 365 is Windows and Mac compatible software. All editions of Windows OS are well suited with the software for example Windows 10, Windows 11, Windows XP, Windows 7, and many more. Also all Mac OS versions are also suitable with this application like Big-Sur, Monterey, High-Sierra, Catalina, etc.

Being a non-technical background user, can I transfer Thunderbird emails to Office 365 easily with Thunderbird to Office 365 Tool?

Answer: Yes, Thunderbird to Office 365 Tool has simple, and interactive interface. And any user can understand the functions of this tool simply without any technical knowledge.  

Summing Up

This blog clarifies on how do I transfer emails from Thunderbird to Office 365. I hope now you are able to conclude that Thunderbird to Office 365 Tool is a securer option than manual method. As the software ensures and delivers error-free output in a minimal time. And we have also discussed on restrictions incur in manual method. Now it would not be difficult for you to to transfer batch emails from Thunderbird profile and mailboxes to Office 365.