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Convert MBOX to MSG

Convert MBOX to MSG
Converts MBOX files to Outlook MSG format. It is possible to retain the original folder structure.
Version: 4.21 released on May 11, 2023.
(4.8 / 125 reviews)

Convert MBOX to MSG for Outlook
You can download a free limited version down below

Main features

  • Converts multiple MBOX files at once. Allows you to select a folder with multiple MBOX files and convert them to MSG format in one go, saving time and effort.
  • Converts any type of MBOX files. Allows you to convert MBOX files from different email clients, including .mbox, .mbx, and .mbs files. 
  • Preserves email metadata and attachments. Preserves all email metadata, such as the sender, recipient, subject, and date fields, along with all the attachments.
  • Maintains the original folder structure. The utility arranges MSG messages in folders named after the original MBOX files. Thus, the emails are placed in folders as they were in the source mailbox. 
  • Can create a new folder structure for the resulting MSG files. Arranges final MSG files in folders using ready-made macros. 
  • Saves Internet message headers and adds information for Windows Explorer. Can keep all key message headers by using Windows Explorer's built-in functions for searching and previewing MSG files.
  • Provides more benefits with the advanced settings. Creates folders from Google labels, enables overwrite mode for the existing files, and moves converted MBOX files or invalid messages to the indicated folders.
  • Allows batch MBOX to MSG conversion. Uses the command line possibilities to create different scripts to convert MBOX to MSG in bulk and on schedule. The option is available in the Professional Edition of the utility. 
  • Has an easy-to-use interface and customer support. The user-friendly and easy-to-navigate tool interface makes the conversion process simple and straightforward. Customer support helps users with any issues they may have during the conversion process.
  • Ensures high conversion speed and security. Converts MBOX to MSG files quickly and accurately by operating on your local computer.

What is MBOX format?

MBOX is a file format to store email message databases. It is commonly used by many email clients such as Thunderbird, Apple Mail, Eudora, and others. MBOX files may vary in extension, like mboxo, mboxrd, mboxcl, and so on.

The MBOX files are used to back up and archive email data.

What is MSG format

MSG is a Microsoft Outlook and Exchange file format to store individual email messages. MSG files can be opened and viewed directly in Outlook. They are used for archiving, backup, and migration purposes.

What is the difference between MBOX and MSG?

MBOX stores multiple email messages in a single file, while MSG files store individual email messages.

MBOX files are commonly used by different email clients, for example, Mozilla Thunderbird, Mac/Apple Mail, Opera Mail, Entourage, etc, but these files cannot be opened in Outlook. MSG is an internal Microsoft Outlook format.

Why convert MBOX to MSG

MBOX format is inconvenient for storing email message databases. You cannot work with messages in Windows Explorer and easily find the ones you need. MBOX files do not support keeping the folder structure – each folder requires a separate file. The MBOX files can be very large, creating additional inconvenience and reducing the reliability of your email backups.

Converting MBOX to MSG can be beneficial in many cases. For example,

  • Transfer your messages to Microsoft Outlook from another email client.
  • Access your email data using Microsoft Outlook or Exchange.
  • Archive your emails in an Outlook format.
  • Use standard Windows tools for browsing and searching emails.

How to convert MBOX to MSG manually

Manually converting MBOX to MSG can be time-consuming and tedious. To convert MBOX to MSG manually, you need to repeat the following steps:

  1. Open each MBOX file in an email client that supports MBOX format and then save each email message from the MBOX database as an EML file. To automate this process, you can use the MBOX to EML converter
  2. Open each EML file individually in Microsoft Outlook and save it as an MSG file.
  3. Repeat step 2 for each message to be saved in MSG format. To automate the process, use the EML to MSG converter

These steps need to be repeated for each MBOX file that you want to convert. The manual method is complicated and may not result in the preservation of all data and metadata.

Pitfalls of the MBOX to MSG online conversion

Online MBOX to MSG conversion can seem easy and fast. In fact, it is risky as it may not always be accurate or secure.

  • Online converters are not as secure as a locally installed tool, leaving your data obtainable to hacking or third-party use.
  • Online conversion tools may not be able to preserve all of the email metadata or attachments, resulting in the loss of important information.
  • Online MBOX to MSG converters may not be compatible with all MBOX file types, which can result in errors or incomplete conversions.
  • Online conversion may be slow, and it requires a stable internet connection.
  • Online conversion services often charge a fee for their services. This fee is based on the total size or number of messages. If you use the offline converter, you only pay once, regardless of the file size or number. Compare the costs of different services before making a decision to avoid paying too much.

How to convert MBOX to MSG automatically

Using a specialized locally-installed tool automates the process of converting MBOX to MSG. This is a more efficient and secure option. This professional MBOX to MSG converter saves time and ensures that all data and metadata are preserved during the conversion process. It can be customized to your specific needs.

Benefits of the MBOX to MSG converter

  • Maintains the original mailbox directory structure.
  • Preserves all email formatting and metadata, including Internet headers and attachments. 
  • Converts multiple MBOX files of different types at once.
  • Helps automatically organize final MSG files into new folders, creating them with the macros from the ready-made list.  
  • Provides advanced options to deal with the source MBOX and resulting MSG files, such as different overwrite modes for the existing MSG files, creating folders from Google labels, moving converted files, or saving invalid messages separately. 
  • Provides command-line support for automated bulk conversion. 
  • Offers responsive technical support to help with conversion issues, custom scripts, and complex tasks.
  • Saves time and reduces the risk of errors.

Steps to convert MBOX to MSG:

  1. Launch the utility from the ReliefJet tab on the Outlook Ribbon or from a standalone application.
  2. Select the MBOX files to convert.
  3. Check the “Include subfolders” box to recreate the source mailbox folder structure.
  4. Indicate the target path to the folder with the final MSG files. You can add a macro from the drop-down to automatically arrange MSG files into folders by a desired parameter. 
  5. Check if you want to add Internet message headers or summary information for Windows Explorer.
  6. Select any additional options from the Advanced tab: 
    • Create folders from Google labels.
    • Choose overwrite mode for the existing files: auto rename, overwrite, or skip the existing files.
    • Specify the destination folder to save the converted MBOX files.
    • Specify the folder to save invalid messages.
  7. Save the current utility configuration by clicking Save
  8. Click the Run button to start the conversion process.
  9. Once the conversion is complete, you can see and save or copy the log report. The final MSG files are saved in the indicated destination.

Bulk MBOX to MSG conversion

This MBOX to MSG converter offers the option to convert multiple MBOX files from different users. You can create various scripts for batch MBOX to MSG conversion using the command line app. This app is provided in the Professional Version of the utility.

This option is very convenient for regular MBOX to MSG conversion. You can use it with the Windows Task Scheduler to make planned conversions.


Can I convert MBOX files from different email clients to MSG?

Yes. This tool is compatible with various MBOX file types, including .mbox, .mbx, and .mbs files, allowing you to convert MBOX files from different email clients.

Will the conversion process affect the original data in any way?

This tool preserves all email metadata and attachments during the conversion process, including source folder structure, formatting, and Internet message headers. It doesn’t affect the original data in any way.

How long does it take to convert MBOX to MSG?

The time it takes to convert MBOX to MSG depends on the size of the MBOX file and the number of files being converted. However, this tool provides a high conversion speed, reducing the time required to complete the conversion process to a minimum.

Can I convert multiple MBOX files at once?

Yes, this tool offers a mass conversion option, allowing you to convert multiple MBOX files at once.

The command line app allows you to perform batch MBOX to MSG conversion for complex multiple mailbox migration scenarios.

Are there any limitations to the size or number of the MBOX files to be converted to MSG?

This MBOX to MSG conversion tool can handle any number of large MBOX files without any issues. It may take more time to convert multiple large MBOX files.

Can I convert MBOX to MSG on a Mac?

No. This MBOX to MSG conversion utility is not designed to work on Mac operating systems.

OutlookFreeware.com Outlook Ribbon
All utilities easily integrate with Outlook (optionally)

* This utility is for non-commercial home use only. It will not run in domain enviroment. Some of the described features and support for domain enviroment are available in advanced version of the utility only. Free version may have additional limitations.

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