How to View and Open MBOX Files on Mac? Quick Ways

Written By
Shivansh Shukla

Updated on
January 14th, 2026

5 minutes Read
5/5 - (1 vote)

Introduction: A user has backed up important emails in an MBOX file to keep them safe offline. Now, they need to review these past conversations and download some important attachments. For this, they need to open MBOX files and read them to access the stored email messages. For viewing a few MBOX files, a free manual way works fine. But, directly opening the files with minimum manual effort, use the MacSonik MBOX File Viewer. With this tool, users can not only view their MBOX files but also save them in multiple formats.

User-Query:
I have an MBOX file that contains old, important emails. Now, I’m looking for a reliable method or a professional tool that efficiently opens the MBOX files without hampering the structure.

Methods to Open MBOX Files

In this section, we will look at multiple methods to open and view your MBOX files. We have discussed both manual solutions and introduced an automated tool that easily and securely opens the MBOX files.

Open and View MBOX Files in Thunderbird

Thunderbird is an open-source email client. It supports MBOX files. To view the MBOX files, users need to import MBOX files in Thunderbird using an add-on.

Here are the instructions to start the process:

  1. Download and launch the Mozilla Thunderbird application.
  2. Now, add an existing Thunderbird profile.
  3. After that, go to Add-ons & Themes > Search and install ImportExportTools NG.
  4. Then, close and re-open Thunderbird to add the extension.
  5. Right-click on Local Folders > ImportExportTools NG > Import MBOX file.
  6. Locate and choose the desired MBOX file you want to open.
  7. You can now read the emails from the folder and open the attachments as well.

Limitations: To open large MBOX files, it can consume a lot of time. The folder hierarchy may not be preserved accurately. Also, it is not suitable for enterprise-level data access.

Open and Read MBOX File Using Apple Mail

Apple Mail has a built-in option to import the MBOX files and open them. Users can easily open and view their MBOX files along with the attachments without installing any software.

Use the following steps to initiate the process:

  1. On your Mac, launch the Mail application on your system.
  2. Now, click on File > Import Mailboxes > Files in MBOX Format.
  3. Then, click Continue and browse the MBOX file, and select it.
  4. Again, click on Continue to start the process.
  5. After the import process is completed, a new folder will be created, Imported Mailboxes.
  6. You can now view and open the MBOX files successfully.

Limitations: In this method, importing large MBOX files will take a considerable amount of time. Also, the folder structure will not be retained.

Easily Open MBOX Files Using a Dedicated MBOX File Viewer

To easily open and read MBOX files without any technical complexity, use the MacSonik MBOX File Viewer. This tool effortlessly opens the MBOX files without affecting the structure and formatting. With its built-in preview feature, users can easily view their MBOX files and the attachments. Also, the tool offers to export the MBOX files into multiple file formats while ensuring data integrity. Additionally, it is also equipped with features to simplify email management.

Simple steps to view MBOX file:

  1. After downloading and installing the tool, open it.
  2. You need to choose between Select File/Multiple Files or Select Folder.
  3. Click Next and use the Select File(s) option to browse and add the required MBOX file.
  4. After it is added, select it and click Next to continue.
  5. Now, from the left panel, select the folders to convert and tap Next.
  6. Choose the desired File Format to save the file and apply the necessary filters.
  7. Next, choose the path to save the file and hit Convert to begin the process.

Also Read: Import MBOX to Thunderbird

Real-life Scenario:
An employee uncovers archived emails stored in an MBOX format from their previous email client. Now, he wanted to review his past conversations and attachments. Manually opening the files individually is a cumbersome task. Therefore, with the help of MacSonik MBOX File Viewer, the MBOX files were opened successfully.

Conclusion

Users usually need to open MBOX files to access the backed-up emails. This write-up includes various methods, both manual and automated, that successfully open up MBOX files. The manual methods are lengthy and require a little bit of technical knowledge. Alternatively, the automated tool, the MacSonik MBOX File Viewer, easily opens the MBOX files and supports conversion to various formats as well. It ensures 100% data integrity and maintains the structure and formatting.

Frequently Asked Questions

Q1- Is it possible to view large MBOX files?

Ans- Although one can view large MBOX files through the Thunderbird email client but it will take a lot of time. On the other hand, with the help of an automated tool, users can quickly open and view their MBOX files.

Q2- How do I open and view MBOX files directly on a Mac?

Ans- On a Mac, you can open and read MBOX files using Apple Mail by importing them via File > Import Mailboxes. Alternatively, use an MBOX-compatible client like Mozilla Thunderbird to view emails directly. To directly open MBOX files on a Mac, download the MacSonik MBOX File Viewer.

Q3- What is the best method to Open MBOX file on Mac OS?

Ans- The best method to open a MBOX file on macOS is to use a professional MacSonik MBOX File Viewer tool. With this tool, users not only view their MBOX files but also convert them to various file formats.

About The Author:

Shivansh Shukla is a technical content writer who researches and provides reliable solutions to help users resolve their problems. He offers effective procedures for email migration, data backup, and file conversion for all technical and non-technical users.

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