.MBOX File Extension
File TypeE-mail Mailbox File
What is an MBOX file?
An MBOX file is a mailbox file saved in an email storage format used for organizing email messages in a single text file. It saves messages in a concatenated format where each message is stored after another, starting with the "From" header. MBOX files were originally used by Unix hosts but are now supported by other email applications, including Apple Mail and Mozilla Thunderbird.
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.
INBOX.mbox - The name given to the primary Inbox mail folder in Apple Mail, the default email program for Mac OS X.