Knowledge base
Background and solutions for mbox, eml and Gmail archives.
Knowledge base
Background and solutions for mbox, eml, Outlook archives and Gmail exports. Here you find explanations of file formats, common questions and the Mbox Viewer error codes with a step-by-step fix per code. Besides mbox and eml, Mbox Viewer also opens Outlook pst and ost directly, with no conversion, keeping the folder structure, winmail.dat and embedded messages.
info
Everything in Mbox Viewer runs locally in your browser: no uploads, no trackers. The latest release is version 2.2.3 (August 2026).
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