How to Open MBOX Files

By Betshy Paola Sanchez Marr

The term "MBOX" stands for "Mailbox." The MBOX file is a "mail format created for organizing and storing email messages in a single text file," according to Not all mailbox programs use the MBOX file; however, a few do, such as Apple Mail, Microsoft Entourage 2008, Mozilla Thunderbird and Qualcomm Eudora. Moreover, the MBOX file can be viewed by most text editors, such as Microsoft Word, Open Office Writer and Notepad.

Things You'll Need

  • Mailbox software or text editor


Step 1

Right-click on the MBOX file.

Step 2

Click on "Open With."

Step 3

Select the "Choose Default Program" option.

Step 4

Select one of the options provided by Windows; these are the default programs that your computer has found that can open the file.

Step 5

Click on "Browse" only if Windows did not show any default programs. Then, search for a mailbox software or text editor, and click on "Open."

Step 6

Click on "OK." Your MBOX file will open now.

Tips & Warnings

  • If despite of having mailbox software or text editors your computer is unable to open the file, run a registry scan.