MBX file icon

MBX File Extension

Outlook Express Mailbox

What is MBX file?

Full format name of files that use MBX extension is Outlook Express Mailbox. MBX files are supported by software applications available for devices running . Files with MBX extension are categorized as Data Files files. The Data Files subset comprises 1326 various file formats. Microsoft Outlook Express supports MBX files and is the most frequently used program to handle such files, yet 8 other tools may also be used. Software named Microsoft Outlook Express was created by Microsoft Corporation. In order to find more detailed information on the software and MBX files, check the developer’s official website.

Programs which support MBX file extension

MBX files can be encountered on all system platforms, including mobile, yet there is no guarantee each will properly support such files.

How to open file with MBX extension?

Being unable to open files with MBX extension can be have various origins. Fortunately, most common problems with MBX files can be solved without in-depth IT knowledge, and most importantly, in a matter of minutes. We have prepared a listing of which will help you resolve your problems with MBX files.

Step 1. Get the Microsoft Outlook Express

Install software to open MBX file Problems with opening and working with MBX files are most probably having to do with no proper software compatible with MBX files being present on your machine. The most obvious solution is to download and install Microsoft Outlook Express or one to the listed programs: Eudora, Netscape Mail, Pegasus Mail. On the top of the page a list that contains all programs grouped based on operating systems supported can be found. One of the most risk-free method of downloading software is using links provided by official distributors. Visit Microsoft Outlook Express website and download the installer.

Step 2. Verify the you have the latest version of Microsoft Outlook Express

Update software that support file extension MBXYou still cannot access MBX files although Microsoft Outlook Express is installed on your system? Make sure that the software is up to date. Sometimes software developers introduce new formats in place of that already supports along with newer versions of their applications. This can be one of the causes why MBX files are not compatible with Microsoft Outlook Express. The latest version of Microsoft Outlook Express should support all file formats that where compatible with older versions of the software.

Step 3. Assign Microsoft Outlook Express to MBX files

If you have the latest version of Microsoft Outlook Express installed and the problem persists, select it as the default program to be used to manage MBX on your device. The method is quite simple and varies little across operating systems.

Associate software with MBX file on Windows

The procedure to change the default program in Windows

  • Right-click the MBX file and choose Open with option
  • Click Choose another app and then select More apps option
  • Finally select Look for another app on this PC, point to the folder where Microsoft Outlook Express is installed, check the Always use this app to open MBX files box and conform your selection by clicking OK button
Associate software with MBX file on Mac

The procedure to change the default program in Mac OS

  • Right-click the MBX file and select Information
  • Proceed to the Open with section. If its closed, click the title to access available options
  • From the list choose the appropriate program and confirm by clicking Change for all....
  • Finally, a This change will be applied to all files with MBX extension message should pop-up. Click Continue button in order to confirm your choice.

Step 4. Verify that the MBX is not faulty

You closely followed the steps listed in points 1-3, but the problem is still present? You should check whether the file is a proper MBX file. Problems with opening the file may arise due to various reasons.

Check MBX file for viruses
1. Check the MBX file for viruses or malware

Should it happed that the MBX is infected with a virus, this may be that cause that prevents you from accessing it. It is advised to scan the system for viruses and malware as soon as possible or use an online antivirus scanner. If the MBX file is indeed infected follow the instructions below.

2. Verify that the MBX file’s structure is intact

If the MBX file was sent to you by someone else, ask this person to resend the file to you. It is possible that the file has not been properly copied to a data storage and is incomplete and therefore cannot be opened. It could happen the the download process of file with MBX extension was interrupted and the file data is defective. Download the file again from the same source.

3. Check if the user that you are logged as has administrative privileges.

There is a possibility that the file in question can only be accessed by users with sufficient system privileges. Log out of your current account and log in to an account with sufficient access privileges. Then open the Outlook Express Mailbox file.

4. Verify that your device fulfills the requirements to be able to open Microsoft Outlook Express

If the system is under havy load, it may not be able to handle the program that you use to open files with MBX extension. In this case close the other applications.

5. Verify that your operating system and drivers are up to date

Up-to-date system and drivers not only makes your computer more secure, but also may solve problems with Outlook Express Mailbox file. It may be the case that the MBX files work properly with updated software that addresses some system bugs.

Do you want to help?

If you have additional information about the MBX file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on MBX file.

Top File Extensions
Show more
File Extension of the day
kfx icon


Kofax Image Format

KFX files are created by scanning software for storing generated data. The contents of KFX files Files with KFX extension store images captured w...