An .eml file stores e-mail; it can contain only a single message or an entire account's worth of messages. While most common to Microsoft Outlook and Outlook Express, .eml files can also be opened with Apple Mail, Entourage and Thunderbird. However, for maximum portability, an .eml file can be converted into an .mbox file, which is the standard, interoperable e-mail mailbox file type that can be opened and manipulated by almost every e-mail application.
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Download and install Thunderbird.
Install the ImportExportTools Thunderbird extension.
Go to "Tools" "Import/Export in mbox/eml format" "Import all eml files from a directory." Navigate to the directory where your .eml file(s) is located and follow the wizard instructions.
Go into the folder you wish to export into an .mbox. This is most likely the Inbox.
Go to "Tools" "Import/Export in mbox/eml format" "Export folder" and follow the wizard instructions to export your current mail into an .mbox file.
Download and install IMAPSize.
Complete the Add New Account wizard and add your existing e-mail account that contains .eml files.
Right-click the folder you wish to convert to an .mbox file.
Select "Download Messages > To Mbox." Choose a location to save your new .mbox file and click "Save."
Right-click "eml2mbox.zip" (see Resource 4) and choose "Save As." Save the file in the same folder that your .eml file(s) is located.
Launch a command line program. Windows users: click "Start" "Run" and type "cmd" (without the quotes). Mac users: Open Terminal. Linux users: Go to "KMenu" "System" "Terminal Program."
Navigate to the directory where your .eml file(s) is located using the terminal by typing:
Replace /path/to/directory with the path to your specific directory. Windows users must use the backward slash () instead of the forward slash.
Type the following at the command line:
An .mbox version of each .eml in that directory will appear in the same directory.
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