How to Import MBOX Files to Outlook – A Comprehensive Guide
Updated On - November 13, 2026 by Armaan | Reading Time: 9 minutes
Quick Answer
Outlook doesn’t open MBOX files directly. To import them, convert MBOX to PST first. You can do this manually with Thunderbird, IMAP sync, or multiple email clients, but each takes several steps. For a faster way, use Regain MBOX to PST Converter to add single or multiple MBOX files, preview emails, and export them to PST for Outlook.
Emailing is an integral part of our personal/professional lives and there are many email platforms for communication. Various email clients use different formats to store emails. Multiple email clients use MBOX as one of the most popular file formats to store email data. More than 20 email clients (like Gmail, Thunderbird, Spicebird, Eudora, Apple Mail, SeaMonkey, etc.) use this file format. Emails are saved in text format, while attachments are saved in an encoded file type.
Because of its text-based structure, the MBOX format offers several advantages, including widespread adoption and simple message navigation. It is, however, a platform-dependent type. However, if you want to import Mbox files to MS Outlook, you’ll need to convert MBOX files to Outlook PST file format.
Why Do Users Import MBOX Files to Outlook?
Users import MBOX files to Outlook for several reasons, mainly for email management and data migration:
- Switching Email Clients: When users switch email clients, like moving from Thunderbird or Apple Mail to Outlook, converting MBOX to PST helps transfer all their emails.
- Using Multiple Email Clients: Many people use different email programs on different devices. For example, Thunderbird at home and Outlook at work. By importing MBOX files to Outlook, they can keep all their emails in one place.
- Email Backup: Converting MBOX files to PST is a simple way to back up emails. PST files are easy to store, transfer, and access when needed.
- Business or Workplace Needs: Since many workplaces use Outlook, employees may need to move their email data from MBOX to Outlook to stay consistent and follow company guidelines.
- Fixing Compatibility Issues: Sometimes, MBOX files may not be fully compatible with all Outlook features. Converting them to PST ensures everything works smoothly within the Outlook system.
4 Verified Methods to Import MBOX Files to Outlook
There are some manual and automated methods to import MBOX into Outlook. This article will walk you through the best three manual methods for importing MBOX to Outlook PST and one automated method using Regain MBOX Converter tool. Keep reading; the processes are given below.
Method 1. Using Multiple Email Clients
It is a little bit complicated way as it involves multiple email clients and applications. As it is a completely manual process, it is divided into four steps so that you can easily apply and perform the conversion. But remember, you need to install multiple email clients on your device.
Follow the below-given steps for the error-less processing:
Step1: Import MBOX Emails to Apple Mail
- Open Apple Mail, click on the File tab, and then Import Mailboxes.

- Go with the option “Files in MBOX Format” and then continue.

- Make a selection for the MBOX files that you want to import using the Choose button.
- Select the file items to import >> Continue >> Done.
- Move toward the “Import MBOX File” section and replace the file extension to. mbx.
Step2: Open the Imported Files in Eudora
- In this stage, we have to shift these imported MBOX files whose extension has been changed to the .mbx files. For this, use the Eudora application and save these files to the path below:
“C: Documents and Settings\Application Data\Qualcomm\Eudora - Now, open the Eudora application and open the. mbx files that are pasted at the above location. After opening, close the Eudora.
Step3: Import Emails from Eudora to Outlook Express
- Open and launch the Outlook Express.
- Click on the File tab, then Import >> Messages.

- Choose the Eudora application from the list >> Next.

- Now, add the MBOX files by browsing them.
- Move ahead by clicking Next.
- At the end, click on the Finish.
Step4: Import Outlook Express to Outlook
- Open the Outlook application.
- Click on the File tab, then Open and Export >> Import/Export.

- From the next wizard, select Import Internet Mail and Addresses.

- Click on the Next.
- Here, choose for the Outlook Express.
- Now, check the Import mail check box.
- Click on the Next and finally on the Finish
Method 2. Using IMAP Synchronization
This method is ideal if you have an email account configured in both MBOX-supported and Outlook email clients. It works by syncing emails between the two platforms.
Step1: Add Your IMAP Account to Thunderbird
- Open Thunderbird and add your IMAP email account (e.g., Gmail).
Step2: Import MBOX to Thunderbird
- Create a local folder in Thunderbird.
- Drag and drop your MBOX file into this folder.
Step3: Sync with the IMAP Server
- Move the emails from the local folder to your IMAP account.
- Thunderbird will sync the emails to the server.
Step4: Add IMAP Account to Outlook
- Open Outlook and add the same IMAP account.
- The synced emails will appear in your Outlook inbox.
Method 3. Using Thunderbird as an Intermediate Client
This method allows you to export MBOX data from Thunderbird to Outlook using formats like EML or CSV.
Step1: Set Up Thunderbird
- Download and install Thunderbird.
- Import your MBOX file into Thunderbird:
- Open Thunderbird and create a new local folder.
- Drag and drop your MBOX file into this folder.
Step2: Install ImportExportTools NG Add-on
- Go to Thunderbird’s menu and select Add-ons and Themes.
- Search for ImportExportTools NG and install it.
Step3: Export Emails as EML
- Right-click on the folder containing your emails.
- Select ImportExportTools NG > Export All Messages in Folder > EML Format.
- Save the files to a local folder.
Step4: Import EML Files into Outlook
- Open Outlook and create a new folder.
- Drag and drop the exported EML files into this folder.
Method 4. Use Professional tool to open MBOX files to Outlook
As you can see, the above-described manual processes are too lengthy and stressful to perform, so an inexperienced user can’t do them so easily. Therefore, Regain Software has developed an effective professional utility for this purpose. It has a completely automated process.
You don’t need to install multiple email clients, and you don’t need to follow the lengthy process. Just install the Regain MBOX to PST Converter software. Convert your single or multiple MBOX files in a few clicks and use them in MS Outlook without fear of data loss. Regain MBOX Converter tool allow the user to import MBOX files to Office 365, Gmail, Yahoo Mail, PST, EML, MSG, and many more email format. To check software features, Go through the free version.
Free Download100% Secure Buy NowPrice: $29
What You Will Get with this Professional Utility?
- This professional utility is developed by keeping use-friendliness at the center of the development process. It has a number of user-centric advanced features to help the user by facilitating the import of MBOX files in Outlook. Some of its highlighted offerings are:
- You can add multiple MBOX files and convert them to PST, and in this way, you can import MBOX files to Outlook.
- Along with converting to PST, you also get options to convert into MSG, EML, PDF, HTML, and other file formats.
- Software facilitates you to directly migrate emails from MBOX to Office 365, MBOX to Gmail, and Yahoo Mail-like prominent platforms.
- It comes with a very user-friendly GUI; any non-technical user can easily convert to PST.
- Its advanced algorithm keeps the data originality intact and keeps all attributes as it is even after conversion.
- This utility is compatible with all Windows versions; hence, there is no need to worry about the versions.
How to use Regain Software to open MBOX files to Outlook?
The conversion steps are so easy, and it’s just a matter of a few single clicks. Keep reading; you will get the step-by-step process below.
- Install and launch the Regain MBOX Converter tool.

- Browse and add the MBOX files that you want to convert.

- After that, you will get a preview of the scanned MBOX files.

- Select your required file format (for now, PST) and save the location.

- Lastly, wait a while for the conversion process to complete. You will get a message “ Process has been completed”.

Over to YOU!
In this step-by-step guide, we’ve walked you through the process of importing MBOX files into Microsoft Outlook, a task that can greatly simplify email management and data migration. MBOX is a commonly used email data format, favored by over 20 email clients such as Thunderbird, Apple Mail, and Eudora. However, when transitioning to Microsoft Outlook, which utilizes the PST (Personal Storage Table) file format, it becomes essential to convert MBOX files to PST.
Throughout this guide, we’ve explored the primary reasons users opt to import MBOX files into Outlook. Additionally, we’ve presented four distinct methods for achieving this objective, encompassing both manual techniques and an automated solution. Must download and try the free demo version of Regain MBOX Converter.
Video Tutorial for MBOX to Outlook Migration Using Regain Software – Watch Now!
Frequently Asked Questions
Q1. Can I import MBOX files directly into Outlook?
Ans. No. Outlook doesn’t have a built-in option to import MBOX files, because it works with PST and similar formats. You need to convert MBOX to PST or EML first. You can do this with Thunderbird or with a dedicated tool like the Regain MBOX to PST Converter.
Q2. What is the best way to import MBOX files to Outlook?
Ans. It depends on your data size and technical skill. For one small mailbox, the Thunderbird method with the ImportExportTools NG add-on can work. For bulk or large MBOX files, or if you want fewer steps, use the Regain MBOX to PST Converter. It converts the files to PST directly.
Q3. How can I import MBOX to Outlook without installing multiple email clients?
Ans. Use a professional converter. The manual route needs Apple Mail, Eudora, Outlook Express, or Thunderbird, depending on the method. The Regain MBOX to PST Converter lets you add MBOX files, preview them, and save them as PST, so you don’t need any other email client for the conversion.
Q4. Can I import multiple MBOX files into Outlook at once?
Ans. Manual methods need you to repeat the steps for every MBOX file. This takes a lot of time when you have many files. The Regain MBOX to Outlook Converter can add single or multiple MBOX files and convert them to PST in one go.
Q5. Can I import MBOX files from Thunderbird, Apple Mail, or Gmail into Outlook?
Ans. Yes. Thunderbird, Apple Mail, and many other email clients use the MBOX format, and Gmail data exported through Google Takeout also comes as MBOX. Convert these files to PST, then open the PST in Outlook. The Regain MBOX to PST Converter works with MBOX files from different email clients.
Q6. Can I try the MBOX to PST converter before buying it?
Ans. Yes. You can download the free version of Regain MBOX Converter tool and check how it works on your own MBOX files. Once you are satisfied with the preview and results, you can buy the full version.











