Convert MBOX Files to MSG Using Simple Steps

Vikas Singh
Vikas Singh

Updated On - June 5, 2026

I first needed to convert MBOX files to MSG format while managing archived Thunderbird emails inside an Outlook environment.

Since MBOX files are incompatible with the Outlook environment, accessing them becomes difficult. But Outlook handled MSG files much more efficiently for individual email access, email sharing, Outlook-based workflows, message organization, & attachment handling.

In short, this conversion is necessary for both compatibility & maintaining proper accessibility across different environments. So, this easy write-up will help you with the needed reasons & methods to export MBOX to MSG hassle-free.

Brief About MBOX & MSG Files:

  • MBOX format: Mailbox storage format supported by multiple email clients like Thunderbird, Apple Mail, SeaMonkey, etc.
  • MSG format: Outlook supported file format for storing individual email messages separately.

Reasons to Convert MBOX to MSG files: Know the Need

Converting MBOX files to MSG will provide several benefits to users. Some of them are listed here.

  • Compatibility: Ensures compatibility with several email clients.
  • Ease of Sharing: MSG files are commonly used for sharing individual email messages, making it easier to exchange specific emails with others.
  • Migration Purposes: Migrating between email clients or platforms, MSG files are often preferred for their ease of transfer and import.
  • Storage Optimization: The export MBOX to MSG file process can help users in optimizing storage space.
  • Selective Extraction: MSG format allows selective extraction of individual emails from MBOX files, enabling users to manage their email archives more effectively.

Common Scenarios for MBOX to MSG Conversion

Explore some common scenarios that create the need to convert MBOX to MSG files.

  • Individual email archiving.
  • Apple Mail to Outlook transfer.
  • Thunderbird to Outlook migration.
  • Legal email storage requirements.
  • Outlook-based enterprise communication.

Important Considerations Before MBOX to MSG Conversion

Here are some important considerations that help you to make the export MBOX to MSG process smooth.

  • Backup original MBOX files.
  • Verify mailbox consistency.
  • Check attachment accessibility.
  • Validate Outlook configurations.
  • Organize mailbox folders properly.

How to Convert MBOX to MSG Files Manually?

After deep analysis, we have identified a manual solution for MBOX to MSG conversion. To convert MBOX files to MSG, follow the provided sections carefully.

Part 1. Configure the Email Account in Thunderbird and Export Emails into EML Format

First, you have to configure your email account in the Thunderbird application and export the emails into EML format. Here are the detailed steps to do the same.

  1. Launch the Thunderbird application on your system.
  2. Click on Account Settings under Settings.Click on Account Settings under the Settings
  3. Select Add Mail Account option from the drop-down list under Account Actions.Select Add Mail Account option from the drop down list under Account Actions
  4. Enter your account details, such as Your full name, Email address, and Password, in their respective columns and click Continue. After that, select IMAP from the Available configurations and proceed to the Done option.Enter your account details such as Your full name Email address and Password in their respective columns and click Continue
  5. You have configured the email account successfully in the Thunderbird application.
  6. Click on three lines from the top corner to add the ImportExportToolsNg add-on using the Add-on and Themes option.Click on three lines from the top corner to add ImportExportToolsNg add on using the Add on and Themes option
  7. Select the emails that you want to convert, then right-click on them. Choose the Export Messages As option, then click on EML Message Format and proceed to Messages (Attachments Embedded).select email then right click on them and choose export messages then click on eml message format and proceed to messages
  8. Choose the desired folder to save the converted emails and click on the Select Folder option.

Part 2. Utilize Outlook to Convert EML Files into MSG Format

Once you have exported your emails into EML format, you can access them in the Outlook application to save them in MSG format. To do so, follow the provided instructions.

  1. Drag & drop the converted emails into the Outlook application to access them.
  2. Click on the email that you wish to convert, then go to the File tab, and click on the Save As option.click on the email then go to file tab and click on save as option
  3. Select Outlook Message Format—Unicode (.msg) using the drop-down menu and proceed to the Save option.Select outlook message format unicode
  4. Repeat the process to save the multiple emails in MSG format.
Another Adjustment: You can execute the conversion by using the Thunderbird & Outlook account. First, you need to sign in to Thunderbird & import the MBOX files. Then, configure the Outlook account within Thunderbird and drag & drop the needed emails into the Outlook folder.

Why is Choosing a Professional Tool More Beneficial For You?

By using the above solution, you can easily convert MBOX to MSG files. But it has certain limitations, like incompatibility for bulk conversion, complex nature, etc can fail the conversion. To avoid all these limitations and get a smooth conversion experience, utilizing an automated solution can be the best possible resort.

The MBOX to PST Converter allows you to convert your MBOX files into MSG & other formats [PST, EML, etc] with a few simple steps. The software allows you to directly save the MBOX file in Office 365 with zero data loss. It comes with a conversion rule feature, using which you can filter the data by Date, Subject, To, From, and more.

Free Download

Moreover, the live preview feature sets it apart from other similar tools. By using this feature, you can get a detailed preview of your mailbox items before exporting them to the desired location. You don’t need to worry about the migration as your data is migrated with absolute precision without altering the original structure (maintaining the original hierarchy).

Follow the steps to convert MBOX files to MSG easily:

  1. Launch the application and select your email client.launch application and select email client
  2. Tap on Add Folder to select the folder that contains MBOX files and proceed to Next.tap on add folder and then proceed to next
  3. Choose the folders from the Folder List to preview the content.Choose the folders from the Folder List to preview the content.
  4. Click on Save, and a conversion wizard option will pop up. Select the filters according to your requirements under the ‘Define Filter Criteria for conversion’ section.Click on save and select the filters under Define Filter Criteria for conversion
  5. Select Save in MSG format, then Browse to choose the saving location, and check the Save in folder hierarchy option to Save the converted file.Select Save in MSG format then Browse to choose the saving location and check the Save in folder hierarchy option
  6. Monitor the conversion progress in the dialog box.Monitor the conversion progress in the dialog box
  7. You can see the location of your saved files on the screen.see the location of your saved files on the screen
  8. A PST file is stored at your desired location.

Final Thoughts

The blog has discussed the best possible method to export MBOX to MSG file with all the needed information. But the method is not appropriate for large mailbox conversions. In such a situation, relying on the recommended MBOX Converter software will help you accomplish the task smoothly.

FAQs

Q. Can attachments remain intact during conversion?

A. Yes. If you execute the manual method properly, all the email attachments & structures may be preserved.

Q. Why do some MSG files fail to open after conversion?

A. Incomplete conversion or corrupted source mailbox structures can interrupt MSG compatibility.

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