Batch conversion
Process entire folders of MSG files in a single run. Progress bar, ETA, pause/resume, and an automatic log file are all included.
Native macOS app · 2026
Convert Outlook .msg files
Convert Outlook .msg files
to EML.
No more emails locked away. Convert single messages or entire archives to EML and MBOX — native, sandboxed, and fully offline.
Sandboxed & signed
100% offline
No tracking, no telemetry
Apple Silicon Universal
Made in Germany
Everything you need for Outlook migration and email archiving.
Built for IT administrators, compliance leads, and anyone who refuses to leave their Outlook archive behind when moving to macOS.
Full .msg support
Native rendering with HTML & plain text, all metadata, and attachments. Built on a custom CFB parser with no external dependencies.
Multi-window support
Open and compare multiple emails side by side. Each gets its own window with its own history.
MBOX export
Archive in the open MBOX format — perfect for Apple Mail, Thunderbird, or long-term storage. Single and batch export.
Spotlight integration
Subjects, senders, and full text of your MSG files are indexed — instantly findable from Finder.
Quick Look
Just tap the spacebar in Finder: subject, sender, recipients, and content — without opening the app.
Multilingual
Fully localized in English and German. Automatic detection of the system language, or pick your own.
Versatile export
EML (Mail.app-compatible), PDF, print, or share via AirDrop. Extract attachments with a single click.
100% offline & secure
Everything stays on your Mac. No cloud, no telemetry, with built-in phishing protection for links.
See MsgToEml in action.
From the first open to a batch run across thousands of files — a clean SwiftUI interface, Light and Dark Mode ready, fully keyboard-driven.
Email view with export menu
Native rendering with HTML & plain text, all headers and attachments. Export as EML, PDF, MBOX, print, or share via AirDrop — all from one menu.
Welcome screen
Get started in one click: open a single MSG file, convert an entire folder — or simply drag & drop.
Attachments, visible & exportable
All attachments in a clear list. Save them to disk individually or in a single batch with one click.
Batch settings
Format, subfolder behavior, error handling, and folder structure — configurable for any migration or archival workflow.
Batch progress & ETA
Per-file live status, pause/resume, and an automatic log file — perfect for audits and compliance evidence.
Convert thousands of emails in a single pass.
Designed for migrations, handovers, and compliance archiving — with everything you need to document the results clearly.
Outlook archive → Apple Mail, in hours instead of days.
Batch mode converts entire directories recursively, preserves folder structure on request, and skips broken files instead of stopping.
Progress & ETA
Precise percentage and estimated time remaining in real time.
Pause & resume
Stop conversion at any time and pick up later without losing data.
Automatic log file
Date, time, file size, and status for every file — ideal for audits.
Smart error handling
Broken files are skipped so the run keeps going.
Subfolder support
Recursive search — optionally preserving the original folder structure.
MBOX bundling
Optionally combine all emails in a folder into a single MBOX archive.
Three common scenarios.
Migrating to Apple Mail
Switching from Outlook to macOS Mail? Convert every .msg archive to EML in one pass and import them directly.
Long-term email archiving
Preserve Outlook archives in the open EML or MBOX format — independent of any specific mail app.
Compliance & audit
Detailed log files document every conversion — traceable for GoBD, GDPR, or ISO audits.
Keyboard shortcuts.
⌘ OOpen MSG file
⌘ ESave as EML
⌘ SSave as PDF
⌘ PPrint
⌘ ,Settings
⌘ ?Help
Frequently asked questions.
What is a .msg file — and why should I convert it?
.msg is Microsoft Outlook's proprietary format for individual emails. EML, by contrast, is an open standard (RFC 5322) that Apple Mail, Thunderbird, and nearly every mail program can read directly. Converting makes your Outlook archives portable and ready for long-term storage.
Does anything leave my Mac during conversion?
No. MsgToEml is a sandboxed macOS app with no network access for the conversion process. All data is processed locally — no cloud, no tracking, no telemetry. Remote images in HTML emails aren't loaded by default either.
How many files can I convert at once?
There is no hard limit. Batch conversion handles thousands of files with a progress bar, ETA, pause/resume, and an automatic log file. Recursive processing of subfolders can be enabled as an option.
Can I import the converted emails directly into Apple Mail?
Yes. EML files can be dragged and dropped into any mailbox folder. Alternatively, export an MBOX archive and use the built-in mailbox importer in Apple Mail or Thunderbird.
Does the app work on Apple Silicon and the latest macOS?
Yes. MsgToEml is built as a Universal Binary, optimized for Apple Silicon (M-series) and Intel, and supports macOS 13 Ventura through macOS 26 Tahoe. Written in Swift / SwiftUI with a custom MSG/CFB parser and no external dependencies.
Are attachments included in the conversion?
Yes. Attachments stay embedded in the EML or MBOX file and can also be extracted and saved separately with a single click.
What's the difference between EML and MBOX export?
EML stores each email as a standalone file — ideal for selective filing or forensics. MBOX bundles multiple emails into a single archive — ideal for importing as a mailbox folder into Apple Mail or Thunderbird.
Ready to leave Outlook behind?
Get it for macOS now — one-time purchase, work locally, no subscriptions.