.MBOX File Extension

File Type:
E-mail Mailbox File

Having trouble opening .mbox extension? Don't panic! This page explains what mbox files are as well as suggests programs you may use to open mbox files. You can download these programs through this page.

What is a MBOX file?

Mbox file extension has E-mail Mailbox file type, which is associated with the "text files" category.

Mailbox file allows managing email messages and storing them in a text file. The file comes in an email storage file format. It involves a concatenated format to save messages.

MBOX files are used by different email applications, including Mozilla Thunderbird and Apple Mail. However, the .EMLX format, which allows dividing saved messages into single files, has replaced the MBOX format in the version 2.0 of Apple Mail. 

To learn how you can open the given file, read the information below.

mbox file icon
File Type:
E-mail Mailbox File
Text Files

How to open MBOX file?

Double click the mbox file to open it. The file will open automatically if file associations have been correctly installed and there is a proper program on your computer; if not, file associations may be corrupted and your OS either cannot find the proper program, or you might not have one for opening the file. First, we recommend downloading our utility to fix file association errors; then, you can download any program for opening the .mbox extension from the ones suggested below. If you are certain there is nothing wrong with the file associations, you may proceed to method 2 right away; besides, if you can't make up your mind when choosing the right program, use Universal File Viewer from the last method.

Method 1: Fix file association errors

Follow these steps in order to automatically fix the mbox extension associations' problem in no time:

  • Step 1: Click on "Download Solution" to download automatic tool provided by WikiExt.
  • Step 2: Click "Start Scan" to identify all potential issues.
  • Step 3: Review scan results and click "Fix Items".

File Size: 3.04 MB, Download time: < 1 min. on DSL/ADSL/Cable

This Tool is Compatible With: Windows XP, Vista, 7, 8/8.1, 10

Method 2: Download the appropriate software

The given list provides programs which may be used for opening or converting the mbox file. Choose the proper program for your OS, and click it to start the download or proceed to the developer's website.

Programs that open MBOX files

  • Windows Windows
    • Mozilla Thunderbird Mozilla Thunderbird
    • CoolUtils Total Thunderbird Converter CoolUtils Total Thunderbird Converter
    • Kernel MBOX Viewer Kernel MBOX Viewer
  • MacOS MacOS
  • Linux Linux
    • Mozilla Thunderbird Mozilla Thunderbird

Method 3: Use universal file viewer

In addition to the list of programs above, we recommend using Universal File Viewer. This tool can open over 250 file extensions and, most likely, it will be able to open the mbox file as well. Download Universal File Viewer for your OS.

Download for Win
Secure download
Download for Mac
Secure download