How to Migrate Emails from Thunderbird to Exchange Server?

Admin ~ March 3, 2025 ~ 5 Minutes Reading

Currently, various users have demanded to migrate emails from Thunderbird to Exchange Server to upgrade their email infrastructure. When transferring Thunderbird emails to Exchange Server, users seek better collaboration, security and centralized email management. In this guide, check two easy ways to transfer Thunderbird emails to Exchange Server by manual and using Thunderbird Converter.

Thunderbird is an open-source email client that allows users to configure email via IMAP, POP or SMTP Server. It stores emails in MBOX format by default and is widely used for individual and small business.

Microsoft Exchange Server is especially designed for business and organizations. It offers advanced levels of security features such as robust security features, shared mailboxes, calendaring and real-time synchronization with all devices.

Motives to Transfer Thunderbird Emails to Exchange Server

  • It offers centralized email management for easier handling of emails.
  • Exchange server supports contacts, calendars, tasks and real time collaboration which is not available with Thunderbird.
  • Exchange offers various security features such as encryption, anti-spam and compliance tools that do not exist with Thunderbird.
  • Users can access their emails from Outlook, webmail, it will eliminate the need to depend on a specific machine.
  • Exchange Server is suitable for growing business as it easily handles large volumes of emails.

How to Migrate Emails from Thunderbird to Exchange Server Manually?

As Mozilla Thunderbird contains emails in MBOX format, or Exchange Server supports PST files. So, there is no direct way to transfer Thunderbird emails to Exchange Server. So, you need to follow multiple-step process as we have stated below:

  1. First, open “Thunderbird” and select the email.
  2. Right-click on the “Chosen email” and press on Save As.
  3. Select file type as “EML file” and save the emails at a time.
  4. Open “Microsoft Outlook” and create a new folder in it.
  5. Drag and drop exported EML file into the new folder in “Outlook”.
  6. In Outlook, Go to file and click on “Open and export”.
  7. Next, press on “Import/Export option” in the list
  8. Import/Export pop up appears on display, choose “Export to a file”.
  9. Select “Outlook data file(.PST)” and press Next to proceed.
  10. Browse destination and click on “do not export duplicates”.
  11. Press the finish button to get the “exported PST file from Outlook”.
  12. Open “Exchange Admin Center(EAC)” and navigate to recipients.
  13. Choose mailboxes and select “Import PST” and browse the exported PST file.
  14. Start the import process to “access Thunderbird emails in Exchange Server”.

Challenges of Manual Migration

  • Time consuming and not suitable for bulk email transfer.
  • Risk of data loss, missing email properties, or formatting will not maintained
  • Attachment may not be preserved properly during migration.
  • Requires Outlook installation and exchange Admin access.

How to Transfer Thunderbird Emails to Exchange Server via Thunderbird to Exchange Server Migration Tool?

If you’re wondering for the way to transfer Thunderbird emails to Exchange Server in batch mode or want to proceed with minimal efforts. So, we suggest you choose Thunderbird to Exchange Server Migration Tool. As it can auto-detect Thunderbird profile or can also convert multiple Thunderbird profiles. This software has now become the first choice of users as it offers faster performance and high accuracy results.

Steps to Migrate Emails from Thunderbird to Exchange Server

  1. Download and install “Thunderbird to Exchange Server Migration Tool” on your system.Launch Thunderbird to Exchange Server Migration Tool
  2. Click on the “Convert configure Thunderbird profile” as you wish to convert.convert configured Thunderbird mailboxes data
  3. Select “Thunderbird mailbox folders” as you want to access in Exchange Server.Thunderbird mailbox folders
  4. Choose “Exchange Server” in the list of select saving options.Select Exchange Server
  5. Select language and enter “domino username/password”.browse language
  6. Fill Server name and press Next to start “migrating emails from Thunderbird to Exchange Server”.start migrate emails from Thunderbird to exchange server

Notable attributes of Thunderbird to Exchange Server Migration Tool

  • It offers to migrate Thunderbird emails to Outlook, Microsoft 365, Gmail, and all IMAP Supported email services.
  • You can also use advanced filters to migrate Thunderbird mailbox data as per date range, sender blank address, receiver blank address, subject, sender, recipients etc.
  • This software has been specially created with a simple initiative interface to easily perform by any corporate or individual users.
  • With this wizard, you can convert individual or multiple Thunderbird profiles at a single process without losing any information.
  • You can also convert Thunderbird emails to PDF, PST, MBOX, TXT, HTML and many more with this application.

General Inquiries about Migrate Emails from Thunderbird to Exchange Server

Can Thunderbird connect to Exchange server?

Yes, Thunderbird can connect to Exchange Server using IMAP or POP if the server has these protocols enabled. However, it doesn’t support native Exchange protocols(MAPI or EWS). For full functionality, users may need to migrate emails from Thunderbird to Exchange Server.


How do I forward an email to an Exchange server?

To forward an email to an exchange server, open the email in Thunderbird and click on forward then enter Exchange email address and send it. If auto-forwarding is needed, set up a message filter in Thunderbird to forward emails automatically based on conditions.


What is the difference between forward and redirect in Exchange?

Forwarding sends an email to another email address with you as the sender. Redirect it while keeping the original sender details. Forwarded emails appear as if they are from you, while redirect emails look like they were sent directly from the original sender.

Overall Reflection

By following this tutorial, you can easily migrate emails from Thunderbird to Exchange Server by manually and Thunderbird to Exchange Server Migration Tool. However, as we have seen the manual approach contains numerous limitations. So, we recommend you to opt Thunderbird to Exchange Server Migration Tool as it’s the best way for multiple Thunderbird emails and can also convert multiple Thunderbird profiles without leaving any data behind.