How To Convert Thunderbird To Outlook Complete Guide?

nova grayson

nova grayson

Jul 23, 2025

4 min read

Migrating from Mozilla Thunderbird to Outlook can be tricky when dealing with various file formats and email clients. This guide will simplify and help you understand the entire process, offering step-by-step instructions to convert Thunderbird to Outlook account quickly and safely without data loss.

Why is Conversion from Thunderbird to Outlook Required? 

  • Office Integration: Outlook has Microsoft Office integration, which is used by many professional individuals and organizations in their daily work. The implementation of Office in Outlook gives them a big advantage and a reason to switch.

  • Better Security: The enterprise-grade security of Microsoft is matched by no one, not even Thunderbird, resulting in swift performance on the platform.

  • Cloud and Mobile access: One of the biggest advantages Outlook has the mobile access and cloud access for all its apps, which Thunderbird lacks. Thunderbird stores data locally, which results in resource usage as well as no access without the device, both limitations Outlook doesn’t have.

Who Should Consider The Migration?

  • Professionals and Large Organizations: Microsoft Outlook speaks loudly of Unified integration and communication, plus the scheduling in Outlook makes it ideal for organizations and professionals to use this email client to streamline workflow.

  • IT department: Information and Technology department is such a unified field that management and communication are crucial, plus security is something this department can’t take for granted. Outlook provides a solution to all this with services like Exchange and admin control.

What You Need To Know Before You Start? 

Before you convert Thunderbird to Outlook, here are some things you need to prepare to prevent uncertainties like data loss, etc.:

  • Backup Thunderbird profile: Backing up your Thunderbird data is crucial, which includes data like email, calendar, contacts, and settings. Just in case anything goes wrong the the preserved data will act as backup to prevent data loss.

Steps to backup: Locate your Thunderbird profile file on your computer, usually found in your computer’s application data directory 

Then create a separate folder of the data on your computer in a separate location that will act as your backup. Remember that the backup should be stored in a secure location.

  • File formats: It’s crucial to understand file formats before you begin the process for understanding the creation of the appropriate format for your backup and conversion.

MBOX(Thunderbird’s format):This is the default format in which the data is stored according to the folders created inside the Thunderbird email client. For example, the folder of inbox in the email client will be saved in your device with the same name but in MBOX format.

Outlook(PST format): PST or Personal Storage Table is the format in which Microsoft Outlook saves the files on your device from the email client. The data can include contacts, calendars, tasks, notes, and folder structure. 

Note: We have to convert MBOX to PST format if we are transferring data from Thunderbird to Outlook.

Manual Method to Convert Thunderbird To Outlook

This section will cover the step-by-step procedure to convert Thunderbird to Outlook using the manual method, which involves using both the email clients, i.e, Thunderbird and Outlook. 

Method 1: Drag And Drop From Thunderbird Emails To Outlook

Step 1: Open your Thunderbird email client.

Step 2: Choose email folder you want to convert from Thunderbird.

Step 3:  Right-click and select option for “save as”.

Step 4: Select the folder or location to save your file and select EML as your selection format.

Step 5: Open MS Outlook on your device.

Step 6: Right-click on the email account under the side bar and select “new folder.”

Step 7: Name the folder Thunderbird or anything you desire.

Step 8: Once created, export EML files in it by dragging the folder you saved in previous steps and dropping it in the new folder created in MS Outlook.

Step 9: Once upload is completed, you’ll be able to access your Thunderbird data.

How To Save Thunderbird To Outlook Account Using Professional Solution?

Using Professional tools can help you make this lengthy process much more efficient and safe. For this tutorial, we will recommend BitRecover Thunderbird Converter Software that will help you convert Thunderbird to Outlook. Not only prevents data loss, but it also provides features like multi-format export, Advanced filter, Bulk email export, and Simple User Interface.

choose pst

Steps to Import data using professional tool:

Step 1: Download and install the tool mentioned above.

Step 2: Open the software, select between “Convert Emails” and “Contact & calendar.

Step 3: Select the data from single or multiple profiles

Step 4: Select the data from the folder and format of your data.

Step 5: Then select the destination on your device to store data.

Step 6: After the backup is completed, you’ll be able to access your data.

Step 7: Open Outlook and select “Open Outlook data file,” and select the output.

Conclusion 

In conclusion, Migrating from Thunderbird is a bold but right choice. Staying up with the trend is no joke and cannot be underestimated. Outlook’s powerful features make it a robust alternative to switch, and this guide will help you understand what, who, and how to save Thunderbird to an Outlook account.

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