Apple Mail mailbox file
File type: Miscellaneous file
An .ewsmbox file is a mailbox file used by Apple Mail to store email messages.
It belongs to Apple Mail on macOS and Mac OS X and is not intended to be edited as a regular document.
File type category:
Miscellaneous file
Date updated: September 24, 2026
The .ewsmbox file extension is associated with Apple Mail, Apple's email application for macOS and Mac OS X. It identifies a mailbox file used to store email messages for a local mailbox.
The file should be handled through Apple Mail rather than edited manually.
Open the file with Apple Mail on a Mac. If double-clicking it does not open the mailbox, try Apple Mail's mailbox import feature and select the file or the folder containing it.
Use Apple Mail to import the mailbox, then export the messages or mailbox in a format supported by the destination mail application.
Software applications that handle other tasks involving ewsmbox files:
Apple macOS / Mac OS X
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