In today's digital age, we have a plethora of email clients at our disposal, offering users a diverse range of choices for handling their email correspondence. Some individuals, particularly professionals, favor desktop-based email clients over web-based alternatives. Nevertheless, there can be several motivating factors prompting users to consider switching their email client.

This is the moment when users may need to locate their MBOX files across different email applications. Once users have identified the whereabouts of their MBOX files within their systems, they can employ a comprehensive solution for exporting their MBOX data to a different email client. In our current blog post, we aim to furnish our readers with a comprehensive guide on MBOX files, their locations, and related information.

What Is an MBOX File?

"MBOX, a truncated term for 'Mail Box,' refers to a file format that encompasses a collection of diverse email messages presented in 7-bit ASCII text, accompanied by various supplementary data files. These MBOX files consolidate all associated emails into a single, unified file while preserving the original formatting of each message. Originally exclusive to UNIX systems, MBOX has since gained popularity among a wide range of email clients, including:"

  • Mozilla Thunderbird.
  • Mac Mail, Eudora.
  • Entourage.

MBOX is intriguing due to its ability to store email messages as extended plain text documents. Each MBOX email message commences with a "From" tag followed by white spaces and concludes with empty lines. Furthermore, MBOX exists in various forms, all sharing a common lineage. These distinct forms are as follows:

  • MBOX: – The MBOXO format represents the "original" system mailbox format and employs a specific constant string referred to as “???@???” in place of a sender’s email address.
  • MBOXRD: – This MBOX file variant is essentially a modified version of the MBOXO mailbox.
  • MBOXCL: – UNIX “System V” Mailboxes utilize the file extension MBOXCL.
  • MBOXCL2: – The MBOX file extension shares resemblances with the MBOXCL format.

With these considerations in mind, let's move on to the next section of our document, focusing on the whereabouts of the MBOX file.

Where Are MBOX Files Located?

MBOX file locations can vary depending on factors such as the operating system (Windows or Mac), their respective versions, and the email client in use.

To Locate on Windows 7, 8, 8.1 and 10
  1. Go to the Start menu and search for %APPDATA% Go to start menu search %APPDATA%
  2. This will open the Roaming folder automatically. Proceed by scrolling down and then double-clicking on the Thunderbird folder. Double-click on the Thunderbird folder
  3. Choose the folder labeled "Profiles" from the options provided. The appearance of the "Profiles folder" should resemble the following: Select the Profiles folder

Note 1: To navigate directly to the Profiles folder one can follow the path shown below:


In the file path mentioned above, substitute "[username]" with your real username.

Note 2: Please be aware that certain files may be concealed, requiring the user to reveal them initially. To illustrate, follow the steps detailed below:

  1. Click twice on the Desktop's This PC icon to initiate the File Explorer.
  2. Click twice on the Desktop's This PC icon to initiate the File Explorer. Click on the option button
  3. This action will initiate the Folder Options dialog box. Within the View tab, select the "Show files, folders, and drives" option and then click the "Apply" button. > OK. Click Show files, folders, and drives option
To Locate on Linux & UNIX Machines

To find the directories on Linux and UNIX systems, you can access them at the following location:

~/.thunderbird/<Profile name>/

For users employing a third-party build, the folders are located at the following destination:

~/.mozilla-thunderbird<Profile name>

Both of these folders may be concealed, so choose View > Show Hidden Files to reveal them.

To Locate on Mac Machines
  1. Choose the "home folder," then navigate to the "library" folder.
  2. Choose the "profiles folder," then click on the profile labeled "Mozilla Thunderbird." It should resemble the following:

~Library/Thunderbird/Profiles/sample. Default

Another advantage is that Thunderbird can be used across various operating systems. Therefore, it is important to be aware of the location of the user's Thunderbird profile on their computer.

Are you still grappling with the challenge of finding MBOX files? Fortunately, there's an alternative method available to locate these files – a third-party tool that streamlines the process. In the upcoming paragraphs, we will delve into the detailed processes of using the Kernel MBOX Viewer. This tool offers a swift and efficient solution for pinpointing your MBOX files.

Kernel MBOX Viewer

Kernel MBOX Viewer an easy software that helps in previewing MBOX email items without using any MBOX email client. This software boasts an intuitive graphical user interface (GUI) and accommodates compatibility with nearly 20 MBOX email clients, including but not limited to Claws Mail, Evolution, SeaMonkey, Opera, PowerMail, Mulberry, and numerous others. Additionally, it provides a distinctive function for conveniently preserving email list details in an HTML format file. And the most noteworthy aspect of this software? It's completely free of charge!

  1. To begin, obtain the software by downloading it, and subsequently, install it.
  2. Navigate to the Start menu, click on "All Programs," and then choose the "MBOX Viewer tool."
  3. Choose an email client from the provided options and then click on the "Next" button. Kernel MBOX Viewer tool
  4. To choose a specific file or folder, simply click on either the "Add File(s)" or "Add Folder" option. Afterward, click on "Finish" to complete the process. Select folder or files click finish
  5. Choose the folders from the Folder List situated in the left pane. Pick the file you want to view, and finally, click on the "Save" button. Select the file you want to view
  6. ou will see a new window pop up, encouraging you to convert your MBOX files into MSG, EML, or possibly even Office 365. To do that, go to the link given and use the MBOX to PST Converter. After acquiring the Tool, proceed with the following instructions to locate your MBOX file. Information will be display


Locating the MBOX file is a straightforward task, and you don't need advanced technical skills to pinpoint their location. Moreover, if you encounter any challenges with manual approaches, rest assured! KernelApps offers a reliable third-party tool to assist you. Should you have any further inquiries, please feel free to reach out to our dedicated support team without hesitation.