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.MBOX File Extension

File TypeE-mail Mailbox File

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CategoryText Files
FormatText

Text

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

What is a MBOX file?

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.

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Programs that open MBOX files
Windows
Mozilla Thunderbird
CoolUtils Total Thunderbird Converter
Kernel MBOX Viewer
Mac
Apple Mail
Microsoft Outlook 2016
Mozilla Thunderbird
Linux
Mozilla Thunderbird
Updated 11/24/2015

.MBOX Extension Information

This page contains information about the file extension MBOX and its known file associations. Our goal is to help you understand what a *.mbox file is and how to open it.

The E-mail Mailbox file type, file format description, and programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and do not publish any information we have not verified.

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