How to Export to MBOX in Thunderbird

Mozilla Thunderbird stores your emails, trash and various settings in mbox files. These files can be exported for use on other systems or with other email clients. Doing so requires simply downloading an add-on and locating the files you want to export.

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Learn how to export Thunderbird mbox files

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Go to the ImportExport Tools website.

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Right-click on the download link and select "Save Target/Link As."

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Save the ".xpi" file to your computer's hard disk and note the location.

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Start up Thunderbird and select "Add-ons" from the "Tools" menu.

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Click "Extensions" in the new window and click "Install."

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Browse to your saved ImportExport Tools ".xpi" file and click "Open."

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Click the "Install Now" button and close Thunderbird.

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Restart Thunderbird and select "ImportExport Tools" from the "Tools" menu. Click "Options."

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Select the "Export Directories" tab. Check the box next to "Export folders as MBOX file."

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Browse to the drive and folder to which you want to export your mbox files. Click "OK" twice.

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Select "ImportExport Tools" from the "Tools" menu again. Click on "Export all the folders."

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Choose a folder from Thunderbird's collective "Profiles" folder and its contents will be exported as mbox files.