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.MBOX File Extension

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File TypeE-mail Mailbox File

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CategoryText Files


This file is saved in a plain text format. You can open and view the contents of this file using a text editor.


Email storage format used for organizing email messages in a single text file; saves messages in a concatenated format in which each message is stored after another, starting with the "From" header; originally used by Unix hosts but now supported by other email applications, including Apple Mail.

More Information

Version 1.x of Apple Mail used MBOX files and stored them in the /User/Library/Mail/Mailboxes/ directory. However, Mail 2.0 and later uses the .EMLX format, which separates the messages into individual files so that they can be searched by Spotlight.

Common MBOX Filenames:

INBOX.mbox - The name given to the primary Inbox mail folder in Apple Mail, the default email program for Mac OS X.

Program(s) that open .MBOX files
Microsoft Windows LogoWindows
Mozilla Thunderbird
CoolUtils Total Thunderbird Converter
Mac OS X LogoMac OS
Apple Mail
Microsoft Outlook 2016
Mozilla Thunderbird
Linux LogoLinux
Mozilla Thunderbird
Updated 8/6/2015