Mozilla Thunderbird, an open-source application, offers a range of services including email management, RSS Feeds, Junk Filtering, and client chat. It boasts cross-platform compatibility, allowing users to freely download and install the Thunderbird client on various major operating systems such as Windows, Mac, Ubuntu, and Linux.

Certainly, Thunderbird is indeed a contemporary email client; however, in today's professional landscape, many individuals prefer a more secure and sophisticated solution such as MS Outlook. Those contemplating a transition from Thunderbird to MS Outlook face the choice of either a manual process or employing automated tools like the MBOX to Outlook PST Converter.

Reasons for Thunderbird to Outlook Migration

Numerous governing factors encourage users to transfer their Thunderbird mailbox data to Outlook.

  • Numerous Thunderbird users have consistently voiced concerns about encountering problems such as error messages, frequent email deletions, and issues with user profile displays.
  • If you're looking for a simple email solution with no additional features, Thunderbird is a solid option. In contrast, Outlook provides a comprehensive suite of tools beyond email, including an integrated calendar, task management, and contact management features.
  • Outlook, as a component of the Microsoft Office Suite, enjoys significantly greater popularity compared to Thunderbird. It offers a robust set of enterprise-level features and is backed by top-notch customer support.
  • Outlook offers superior support for POP3, IMAP, or Exchange Server accounts.
Export Thunderbird Emails to Outlook PST (Windows, Mac, and Linux Versions)

Thunderbird and Outlook employ distinct native file formats that are incompatible for seamless data exchange. Consequently, when transitioning from Thunderbird to Outlook, the initial step involves converting Thunderbird's MBOX file into the PST format.

Note: Outlook for Windows primarily utilizes the PST file format as its default, whereas Outlook for Mac employs the OLM format as its default.

In the following sections, we have provided a comprehensive explanation of the procedure for converting Thunderbird emails to Outlook.

Migration on Mac Machine

Imagine you're operating both Thunderbird and Outlook on a Mac system, and you wish to transfer your Thunderbird emails to Outlook for Mac. What steps must you take to accomplish this task?

A direct Thunderbird to Outlook converter software that can seamlessly complete the transfer process is not available. Consequently, the initial step involves converting Thunderbird emails to the OLM file format for migration on a Mac machine. To accomplish this, a third-party MBOX file to PST Converter can be employed. It's worth noting that OLM is the native file format for Outlook on Mac, but it can also import PST files. This allows for the manual import of the converted PST file into the Outlook for Mac mailbox without the need for additional procedures.

Migration on a Windows Machine

The preferred method for transferring Thunderbird emails to Outlook in a Windows environment is to utilize trustworthy third-party software for the conversion process. Alternatively, you may choose a manual method if you prefer not to employ any third-party Thunderbird to Outlook conversion software.

Migrating to the Windows platform involves the execution of the following three sequential steps:

  1. Change MBOX emails into the EML file format.
  2. Transfer EML files to Windows Live Mail.
  3. Transfer emails from Windows Live Mail to Outlook PST format.

We will delve into each step with greater detail.

Exporting Emails from Thunderbird to EML format

To begin the process of converting MBOX to EML format, start by manually identifying the necessary email messages using the Thunderbird client. Once you've located them, ensure you meticulously follow the provided instructions.

  1. Choose the messages you want to export. You have the option to either pick individual messages or use the keyboard shortcut Ctrl + A to select all emails within the chosen folder.
  2. To save the chosen items, simply perform a right-click and then choose Save As followed by selecting EML files.
  3. Choose a destination directory for storing the EML files, then press the Save button.

Chosen emails will be stored in the designated location with the file extension (.eml).

Import EML to Windows Live Mail

The second phase includes transferring the stored EML files into Live Mail's mailbox. This can be accomplished manually by adhering to the following instructions:

  1. Open Windows Live Mail on your computer, then either establish a new folder or select an existing one to transfer your data to.
  2. Open Windows Explorer and navigate to the folder where you can find the EML files.
  3. Choose the necessary EML files for export to PST, then simply drag and drop these emails into your preferred Live Mail folder.
Export emails from Live Mail to Outlook PST

Finally, you need to transfer the imported data from Live Mail to an Outlook PST file. To accomplish this task, please adhere to the provided guidelines:

  1. Open Live Mail, then navigate to the "File" menu, and select "Export emails" followed by "Email messages."
  2. In the Live Mail export wizard, choose "Microsoft Exchange" and then click on the "Next" button.
  3. In the Profile Selection dialog, pick "Outlook" as your profile of choice, and then click on the "OK" button.
  4. Please choose the necessary EML folder for exporting to Outlook, and then click the OK button.
Export Thunderbird mail items to Outlook via Gmail

You can effectively migrate Thunderbird to Outlook's PST format by utilizing your Gmail account. To achieve this, simply follow the steps outlined below:

  1. Activate IMAP settings for your Gmail account.
  2. Configure your Gmail account within Thunderbird.
  3. Transfer your Thunderbird email items to your Gmail folder.
  4. Also, configure the same Gmail account in MS Outlook.
  5. Export the email items as a PST file to your desktop.
Automated Tool for Thunderbird to Outlook PST Migration

Exporting Thunderbird to PST manually demands a high degree of precision and skill. For individuals new to the process, executing the migration without expert guidance can be challenging. Consequently, it is advisable to seek assistance from third-party tools and resources to streamline and expedite the migration process.

Kernel for MBOX to PST Converter tool is the most recommended tool to convert Thunderbird’s MBOX file to Outlook PST. This software from a third-party source seamlessly transforms the data while preserving its quality and integrity.

To transform MBOX files into PST format using this tool, adhere to these straightforward instructions:

  1. Open the MBOX Converter software on your computer. Install Thunderbird to PST converter software
  2. Choose the method for including files in the conversion process. To include multiple MBOX files, opt for the "Select File(s)" option. If you wish to import an entire folder that contains MBOX files, select the "Select Folder" option. After selecting the desired mode, click on the "Browse" button to locate the folder containing your MBOX files. Select mode to add files for conversion
  3. Choose the necessary MBOX file, then press the Open option. Afterward, proceed to click the Finish button. Navigate to the directory containing the Thunderbird MBOX files
  4. In the following window, you'll find a preview of the mailbox data linked to the chosen MBOX file. On the left panel, you can view the mailbox folders. To inspect the contents of a specific email item, simply select it. After you've finished reviewing the data, click the "Save" button to store the necessary file. Select MBOX file and open
  5. Once you click the Save button, a new window will promptly open on your screen. Proceed by choosing the PST file format designed for MS Outlook as the output format, and then click Next. Click finish to complete adding files
  6. In the following window, you have the option to refine your selection and retain only particular files for conversion into PST format. Simply implement your preferred filtering criteria and then proceed by clicking on "Next." Preview of emails and other mailboxes
  7. To effectively handle extensive data files, utilize the tool's Split feature. Select the Split option, and from the dropdown menu, designate your preferred file size. Optionally, you can include a prefix in the file name. If you wish to proceed without making these adjustments, simply click "Next." Select PST as a saving option
  8. Navigate to select a destination directory for saving the converted PST file, and then click the "Finish" button. Select filter option
  9. Press the OK button to complete the conversion procedure. Split large PST files

Wrapping Up

Thunderbird uses a common file format to save its data, whether deployed on a Windows, Mac, or Linux machine, whereas Outlook uses PST on Windows and OLM on Mac. For Windows users, to convert Thunderbird to Outlook, the most recommended way is to go for it is a third-party Thunderbird Mail Backup software. This versatile utility is capable of transforming MBOX, MBS, and MSF file formats into Outlook PST, DBX, EML, or MSG formats, and it supports over 20 email clients such as Thunderbird, Apple Mail, Google Takeout, Eudora, ZohoMail, and more. As a result, it serves as a comprehensive solution for seamlessly migrating MBOX data to Outlook PST, Office 365, and Gmail.