DbxConv is a lightweight, open-source DBX to MBOX email converter created by Ulrich Krebs. This portable command line utility lets you convert Microsoft Outlook Express DBX email files into the more universal MBOX format; or into EML files for use in clients like Windows Live Mail, Apple Mail, Thunderbird, and others. Because it's fully portable, you can run DbxConv from a USB flash drive without installation.
DbxConv - Free DBX to MBOX or EML Converter

A dependable solution for anyone migrating away from Outlook Express, DbxConv converts legacy DBX archives into modern, widely supported formats. Whether you're restoring old backups or transferring messages to a new email platform, this tool keeps the process fast, reliable, and accessible.
Key Features
- DBX to MBOX Conversion: Easily convert Outlook Express DBX files into standard MBOX files for use with Thunderbird and other modern clients.
- DBX to EML Conversion: Output individual EML files compatible with Windows Live Mail, Apple Mail, and many other programs.
- Command Line Utility: Ideal for techs and advanced users who prefer a CLI-based workflow.
- Fully Portable: Can be stored and run from a USB flash drive with zero installation.
- Open Source: Freely distributable and modifiable, with development code available.
- Cross-Platform Support: Works on Windows, Linux, and macOS systems.
How to Use DbxConv (Example)
To convert a DBX file to MBOX:
dbxconv -m -o ~/output_directory ~/path/to/input.dbx
This command outputs a ready-to-import MBOX file into the directory you specify.
Why Use DbxConv?
- Perfect for recovering emails from old Outlook Express backups.
- Ideal for migrating to Thunderbird, Apple Mail, or other modern clients.
- Extremely fast and lightweight—just 160 KB extracted.
- No installation, no bloat, no unnecessary interface.
- A reliable option for technicians restoring legacy email data.
Specifications
- Extracted Size: 160 KB
- Developer: Ulrich Krebs
- License: Open Source
- Author’s Website: Project Page
- Download: DbxConv Email Converter Download
Frequently Asked Questions
What does DbxConv convert?
It converts Outlook Express DBX files into MBOX or EML formats, making them usable in modern email clients like Thunderbird, Apple Mail, and Windows Live Mail.
Does DbxConv work on Windows?
Yes. It runs on Windows, as well as Linux and macOS.
Does it have a graphical interface?
No, it is a command line tool. This keeps it lightweight and efficient.
Can it convert multiple DBX files at once?
Yes, by scripting or batching commands you can convert multiple DBX files efficiently.
Final Thoughts
DbxConv remains one of the most dependable ways to convert old Outlook Express DBX files into modern, usable email formats. Its open-source nature, portability, and fast command line workflow make it the perfect tool for migrations, recovery jobs, or archiving old email data. If you’re looking for a simple, stable, and free DBX to MBOX/EML converter, this tool is an excellent choice.