What is MBOX File Extension?


It is a plain text file holding email messages as 7-bit ASCII text. It also holds attachments but in an encoded format. It is widely used to organize messages in a single text file. The starting message body holds "From" and at the bottom, it is blank.

  • mboxo is a prime format using the constant string instead of email address.
  • mboxrd is one of the variations of MBOX,
  • mboxcl is the mailbox format used by Unix 'system V' mailboxes.


It belongs to the database file category.

Supportive Apps

A number of email clients support MBOX. According to a reliable source. It supports more than 20 desktop based email clients.







Apple Mail

Spicebird and much more




The location of email client is depended on the type of email client you are operating it.

Evolution Mail: C:\Documents and Settings\Administrator\.evolution\mail'

SeaMonkey: C:\Documents and settings\Administrator\ApplicationData\Mozilla\SeaMonkey\Profiles\nz8lvw59.default\Mail.

Netscape: C:\Documents and settings\Administrator\ApplicationData\Mozilla\Profiles\default\2yv6fh2e.slt\Mail.

Apple Mail: /User/Library/Mail/[account]/INBOX.mbox/Messages/

Thebat: C:\Users\\App Data\Roaming\The Bat\Mail\profile folder

PocoMail: C:\Documents and Settings\Administrator\Application Data\PocoMail\Mail.

Mozilla Thunderbird: C:\Users\\AppData\Roaming\Thunderbird\Profiles\

Entourage 2008: C/Users/user_name/Documents/Microsoft User Data/Office 2008 Identities/Main Identity

Mulberry: C:\Documents and Settings\Administrator\Application Data\Cyrusoft\Mulberry\Mailboxes

How to open or view MBOX File Extension

The MBOX is a Mail Box file using by various open source programs, Hence, the file extension is accessed by all apps, it is operating on.

 There are some free and paid third-party apps that also support the file extension.

Conversion from MBOX

Conversions to MBOX