Guides
Guides & Tutorials
Step-by-step guides for working with MBOX and EML email archives on Mac and Windows — exporting Gmail, opening huge files, converting formats, and searching like a pro.
- Tutorial
How to Export Gmail with Google Takeout (and Open It on Mac)
A step-by-step guide to exporting your Gmail to an MBOX file with Google Takeout, downloading it safely, and opening it instantly in Mbox Viewer on macOS.
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How to Open an MBOX File on Mac (Even Huge Ones)
Learn what an MBOX file is and the fastest way to open one on macOS — including multi-gigabyte archives from Gmail — without importing or waiting, using Mbox Viewer.
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How to Convert MBOX to CSV, EML, and Text (and Extract Attachments)
A practical guide to exporting an MBOX file into CSV spreadsheets, individual EML messages, plain text, and PDF — plus how to extract every attachment in bulk — using Mbox Viewer on Mac.
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Mbox Viewer Search Syntax Cheat Sheet
A complete reference for searching MBOX and EML archives in Mbox Viewer: from:, to:, subject:, body:, date:, has:attachment, size:>, OR, negation, and exact phrases — with copy-ready examples.
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How to Open a Thunderbird MBOX File on Mac
Thunderbird stores your mail in standard mbox files — they just have no extension. Here are two easy ways to read them on macOS with Mbox Viewer, without importing anything.
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How to Open an Apple Mail Export (.mbox Folder) on Mac
Apple Mail exports a .mbox folder with a file named “mbox” inside — that file is your mail in standard mbox format. Here's how to export from Mail and read the result with Mbox Viewer.
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How to Open an MBOX File on Windows (Any Size)
Windows has no built-in way to open MBOX files, and Outlook can't read them. Here's how to open an .mbox file on Windows 10 and 11 — even multi-gigabyte ones — with Mbox Viewer.
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How to Open a Thunderbird MBOX File on Windows
Thunderbird on Windows stores your mail as standard mbox files with no extension, tucked inside your profile folder. Here's how to find and read them with Mbox Viewer on Windows 10 and 11.
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How to Open a Gmail (Google Takeout) MBOX File on Windows
Downloaded your Gmail with Google Takeout and got a giant .mbox inside a ZIP? Here's how to unzip it on Windows and open the mailbox with Mbox Viewer — no import, no Gmail login.
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How to Open an Apple Mail Export (.mbox) on Windows
Moving from Mac to PC? Apple Mail exports a .mbox package that looks like a folder on Windows. Here's how to find the real mailbox inside it and read it with Mbox Viewer.
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How to Convert Outlook PST/OLM to MBOX (Mac & Windows)
Outlook stores mail in PST (Windows) or OLM (Mac), which Mbox Viewer can't open directly. Here's how to convert PST and OLM files to standard mbox — free, step by step — then read them.
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