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“Major MBOX email clients are supported, and I should praise my team for this wonderful work.”

Managing Director KernelApps

Salient Features

The important features of the free MBOX Viewer tool for viewing entire MBOX file data.

Preview MBOX Emails of 20+ MBOX Email-Clients

Preview MBOX Emails of 20+ MBOX Email-Clients The software is intelligently designed to work with MBOX files that are obtained from versatile MBOX-based email applications, such as Evolution, SeaMonkey, Sylpheed, AppleMail, Entourage, Eudora, Postbox, Opera, & PowerMail. Moreover, the software's GUI integrates all the names of popular MBOX email-clients in a single window, which enhances the usability of software.

Apply Email Filter & Retrieve Commanded MBOX Files

Apply Email Filter & Retrieve Commanded MBOX Files The software is integrated with dynamic email filter options, which helps in segregating the retrieved emails by selected criteria's like To, From, Subject, Date/Time, and Folder. One can access these filter options from the preview windows itself, which is visible on the top of the email list panel as the magnifying glass logo.

Incorporated with Add Files & Add Folder Options

Incorporated with Add Files & Add Folder Options The tool provides user to upload single as well as multiple MBOX files with the help of Add Files & Add Folder options. If you have the complete MBOX folders then select "Add Folder option" for adding multiple MBOX email items.

Save Retrieved Email List in HTML

Save Retrieved Email List in HTML Kernel MBOX Viewer software possesses the facility to save email list information in the HTML file format, which can be accessed with most popular Web browsers like Internet Explorer, Google Chrome, Firefox, etc.

No Restriction to the Size of the File

No Restriction to the Size of the File The tool is designed to process a single or a set of MBOX file(s) of any size without any limitation or restriction for large sized files. Also, you can add a whole MBOX file folder depending on your requirement.

Supports all Formats from MBOX Family

Supports all Formats from MBOX Family The tool is designed to process all sort of MBOX file coming from MBOX family like MBX, MBS, MBOX, MSF, etc. Be it any format, just add it to the tool, and you can view the content easily.

Utilize all Software Features at Free of Cost

Utilize all Software Features at Free of Cost The product offers hassle-free viewing experience of entire MBOX email items at free of cost. One can easily add single or multiple MBOX files, get the required results in the form of hierarchical structure, and have the unrestricted preview of all MBOX email items.

Supports Latest Software Versions

Supports Latest Software Versions The Kernel MBOX Viewer software is enhanced with advanced compatible functionalities and supports Windows 10, 8.1, 8, 7, Vista, XP, 2000, 98, NT, 95 Operating Systems. You can also run this tool on various Windows Server editions like Windows Server 2019, 2016, 2012, 2008 R2, 2008, 2003 R2, & 2003.

20 Mail Clients that use MBOX file format

MBOX (mailbox) is a file format that is used to organize and store email messages. MBOX family has six popular file formats:

  • MBX
  • MBS

As it is an open source format, many email clients
(mostly open source email clients) use this format for storing emails. The default location of the MBOX can vary from email client to email client.


To view a file with the help of Kernel MBOX Viewer, you need to follow the steps mentioned below:
  1. Start with selecting your email client and click on Next
  2. Click on Add Files to add the desired file, select it and click on Finish
  3. Now, select files items individually to view the desired content
Yes, you can open MBX file with this tool. Not only MBX, but you can also open MBS and MBOX. Basically, you can open all the formats from MBOX family.
You surely can proceed with adding as many files you want; the tool is capable of adding as many files as you require. The tool is equipped with two features, Add files and Add Folder, and you can go for either. If you want to add all files from the same folder, then it is suggested to opt for Add Folder option.
Yes, if you have a file created with Sparrow, Gru, The Bat!, PowerMail, GyazMail, Sylpheed, etc., you can open it with Kernel MBOX Viewer.
No, the tool is free now and will be free for lifetime, there are no hidden or extra charges associated with this tool.
The tool is specially designed to process every sort of file, be it small or large, single, or multiple. So, relax and use the tool you won’t face any crashing or lag issues.
Yes, the tool is integrated with a filter feature with which you can search for a specific file from a desired time period. The filter feature of the tool allows you to apply filters on Subject, Date, Time, From, To, and folder.
No, you cannot save the file with this tool; you only can view the content inside the file. If you want to save the file for further use, you can try Kernel for MBOX TO PST tool.

How it Work's


Software Prerequisites & Recommendations

About Software

  • Version


  • Version Support

    Windows 11/ 10/ 8.1/ 8/ 7/ Vista/ XP/ 2000/ 98/ NT/ 95

System Requirements

  • Hard Disk

    50 MB of disk space

  • Memory

    64 MB Minimum

  • Processor

    Intel® Pentium Processor compatible (x86, x64) or equivalent

Software Guides

Upgrade to
Personal/Corporate License

Kernel MBOX Viewer

User Reviews

Kernel MBOX Viewer

(4.9 / 5) 471 Reviews

It is an effective and powerful tool to open and read MBOX files without MBOX to PST conversion. I used it with 100% accurate results. Thanks!


Absolutely satisfied with the performance of this software. I used it to open MBOX files, and it did its job very well. Thanks!

S Elenbass

There is no point that I can complain about this tool. I have great experience with this tool. You can also use it if required.

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