100% Private & Secure

Free OLM Converter
Convert to Any Format

Convert Mac Outlook OLM files to PST, EML, MBOX, CSV, HTML, JSON, or TXT.

7 output formatsMac Outlook supportEmail & contactsInstant conversion

Drop OLM file here

or click to browse

Overview

What Is OLM to MBOX Conversion?

OLM to MBOX conversion takes an Outlook for Mac OLM file (ZIP-based archive with XML email data) and exports emails into MBOX format. MBOX is a single-file mailbox format — one file holds many messages. Thunderbird, Apple Mail, and other clients can open MBOX directly. Converting to MBOX is ideal for migrating from Outlook for Mac to Thunderbird or Apple Mail.

Our free OLM to MBOX converter processes on your device. You drop one or more .olm files, and the tool extracts all emails, then writes them into MBOX. All processing happens on your device; nothing is uploaded to any server.

Use cases include migration from Outlook for Mac to Thunderbird or Apple Mail, backing up Mac mail as a single MBOX file, and importing into other MBOX-compatible tools. No Microsoft Outlook for Mac installation is required — the tool works on Windows, Mac, and Linux on any modern platform.

Features

Features

Why use our OLM to MBOX converter

One MBOX per mailbox

All messages from your OLM can be combined into a single MBOX file — the standard mailbox format used by Thunderbird, Apple Mail, and many other clients.

ZIP-based OLM parsing

OLM is a ZIP archive. The tool opens it on your device, extracts email data from XML, and outputs MBOX.

100% private

OLM is read and converted entirely on your device. Nothing is uploaded. Your Outlook for Mac data stays on your device.

No Outlook required

Use the converter on Windows, Mac, or Linux. No Microsoft Outlook for Mac installation needed.

Preview before convert

See email count and a preview table of extracted emails (From, Subject, Date) before converting to MBOX.

How it works

How to Convert OLM to MBOX

Four steps — no install, no Outlook for Mac, no sign-up

01
01

Open OLM to MBOX Converter

This page opens with MBOX already selected as the output format.

02
02

Drop your OLM file(s)

Drag and drop one or more .olm files. The tool validates the ZIP structure and extracts emails from XML.

03
03

Browse and filter

View extracted emails in the preview. Selected emails will be written into the MBOX file.

04
04

Convert & download MBOX

Click Convert & Download. Emails are saved as one or more MBOX files, ready for Thunderbird or Apple Mail.

FAQ

Frequently Asked Questions

Common questions about OLM to MBOX conversion

Q1. What is OLM to MBOX conversion?
OLM is Outlook for Mac's archive format (ZIP-based). Converting OLM to MBOX extracts each email and writes them into MBOX format — a single file containing many messages, supported by Thunderbird, Apple Mail, and other clients.
Q2. Why convert OLM to MBOX?
MBOX is the standard mailbox format for Thunderbird and Apple Mail. Use it to migrate from Outlook for Mac to Thunderbird or Apple Mail, or to archive all messages in one file.
Q3. Do all emails go into one MBOX file?
Typically yes — you can export all selected emails into one MBOX. Some tools also allow splitting by folder or source OLM. Check the converter options on the page.
Q4. Do you upload my OLM file?
No. Conversion runs entirely on your device. Your OLM is read and parsed on your device. Nothing is sent to our servers.
Q5. Do I need Outlook for Mac installed?
No. The OLM to MBOX converter works on any modern platform. No Outlook for Mac or desktop software is required.
Q6. Can I convert multiple OLM files to MBOX?
Yes. Add as many OLM files as you need. Each is parsed independently. You can merge all emails into one MBOX or create separate MBOX files per source.
Related

Related Tools

More converters and viewers from OnlinePCTools

OLM ConverterOLM to EMLOLM to PSTOLM to MBOXOLM to CSVOLM to HTMLOLM to TXTOLM to JSONPST ConverterMSG Converter