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Free MBOX Converter
Convert to Any Format

Convert MBOX, MBX, and MBS files to EML, EMLX, MSG, PST, PDF, CSV, HTML, TXT, or JSON. Supports Thunderbird, Gmail Takeout, Yahoo, Apple Mail, and more.

9 output formatsBatch file supportThunderbird & Gmail compatibleInstant conversion

Drop MBOX files here

or click to browse · select multiple files

Overview

What Is MBOX to MSG Conversion?

MBOX is a widely-used email archive format supported by Thunderbird, Apple Mail, and Google Takeout. MSG is Microsoft Outlook's single-message format — each .msg file contains one email with headers, body text, and metadata. Converting MBOX to MSG creates individual Outlook-compatible message files from a mailbox archive.

This is useful when migrating from Thunderbird or other MBOX-based clients to Microsoft Outlook, or when you need to share individual emails with Outlook users in their native format.

Our free MBOX to MSG converter processes entirely on your device. Drop your MBOX file, preview the extracted emails, and download each as a separate .msg file. No upload to any server, no Outlook installation needed, and no file size limit.

The tool also supports MBX and MBS file extensions, batch conversion of multiple files, date-range filtering, and deleted mail recovery — all powered by private MIME parsing.

Features

Features

MBOX to MSG conversion capabilities

Individual MSG files

Each email in the MBOX becomes a separate .msg file that opens directly in Microsoft Outlook.

Preserves email data

Subject, sender, recipient, date, and body are all preserved in the MSG output for Outlook compatibility.

Batch conversion

Drop multiple MBOX files and convert all emails to MSG in one session. Supports MBX and MBS too.

No upload — 100% private

Everything processes on your device. Your MBOX file is never uploaded to a server.

No Outlook required

The converter creates MSG files without needing Microsoft Outlook installed on your machine.

How it works

How to Convert MBOX to MSG

Four simple steps

01
01

Open the converter

Navigate to the MBOX to MSG converter page.

02
02

Upload MBOX file

Drag & drop your .mbox, .mbx, or .mbs file into the upload area.

03
03

Select MSG format

MSG is pre-selected. Review the email preview and adjust filters if needed.

04
04

Convert & download

Click Convert & Download. Each email is saved as a separate .msg file.

Frequently Asked Questions

MBOX to MSG conversion

Q1. What is MSG format?
MSG is Microsoft Outlook's native single-message format. Each .msg file contains one email with headers, body, and attachments. It opens directly in Outlook on Windows.
Q2. Can I open MSG files without Outlook?
Some email clients and free viewers support MSG. However, MSG is primarily designed for Outlook. For universal compatibility, consider converting to EML instead.
Q3. Does this preserve attachments?
The converter extracts email content from MBOX and creates MSG-formatted output. Inline text and headers are preserved. Binary attachments from MBOX may vary based on the source format.
Q4. Is there a file size limit?
No artificial limit. The tool processes files on your device, limited only by available memory.
Q5. Can I convert multiple MBOX files?
Yes. Drop several MBOX files at once for batch conversion. All extracted emails will be converted to MSG.
Q6. Do I need to install anything?
No. The converter processes entirely on your device — no software, no plugins, no Outlook required.
Related

Related Tools

More MBOX conversion options

MBOX ConverterMBOX to EMLMBOX to PSTMBOX to PDFMBOX to HTMLMBOX to CSVMBOX to JSONPST ConverterMBOX ViewerMSG Viewer