# Letter Opener - Winmail Viewer

> Converts unreadable winmail.dat email files to accessible formats. (iPhone/iPad app by Letter Opener GmbH.)

- Source: https://appshunter.io/ios/app/letter-opener-winmail-viewer/id635655539 (this page in markdown: same URL + `.md`)
- Developer: [Letter Opener GmbH](https://appshunter.io/developer/373066203)
- Category: Productivity, Business
- Price: Free with in-app purchases
- Rating: 3.48/5 from 772 App Store ratings
- Age rating: 4+
- Requires: iOS 12.0 · 13 MB
- Languages: Dutch, English, French, German, Italian, Japanese, Korean, Portuguese, Russian, Chinese and 2 more
- Released: 2013-04-23
- Data updated: 2026-09-03
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/letter-opener-winmail-viewer/id635655539/reviews.md

## What is Letter Opener?

Open Winmail.dat with just a tap. 

ABOUT
A winmail.dat file is an email from Microsoft Outlook that can not be read by other email applications. It needs to be converted for the content to be accessible. 

Letter Opener does that with a simple tap!

With over 10 years experience (and a special dislike for winmail.dat files) we made sure that working together with Microsoft Outlook and Windows users can be simple and seamless.

FEATURES
- Open Winmail.dat files and convert appointments, notes, contacts etc. to iOS native formats.

- Get access to all attachments in Winmail.dat files.

- Export files to another app.

IN-APP PURCHASES
- Winmail.dat Premium: Access to attachments in winmail.dat files

SUPPORT
We provide direct personal support, so don’t hesitate to contact us if you have any questions or comments: support@winmail.help

Thanks for helping us to keep improving Letter Opener!

## Key features

- Open Winmail.dat files
- Convert appointments, notes, contacts
- Access all attachments
- Export files to other apps
- iOS native format conversion

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Winmail.dat Premium | $3.99 | one-time |
| ZIP-Archive Premium | $3.99 | one-time |



## Frequently asked questions about Letter Opener

### What is a winmail.dat file?

A winmail.dat file is a special email attachment created by Microsoft Outlook. It often contains rich text formatting and other embedded information that standard email clients cannot interpret, making the content inaccessible.

### How does this app help with winmail.dat files?

This app allows you to open winmail.dat files with a single tap. It converts the contents, such as appointments, notes, contacts, and attachments, into formats that your iOS device can understand and use natively.

### Is the app free to use?

The app is free to download and use for basic winmail.dat file opening. However, accessing attachments within winmail.dat files requires a premium in-app purchase.

### Can I export the converted files?

Yes, the app allows you to export the converted files to other applications on your iOS device. This makes it easy to share or further process the content you extract from winmail.dat files.

### What kind of content can be accessed from a winmail.dat file?

You can access and convert various types of content from winmail.dat files, including appointments, notes, contacts, and all associated attachments. This ensures you don't miss any important information sent via Outlook.

## Version history (last 1 release)

### 12.0.6 — 2022-01-07

• New File app like interface.
• Dark Mode for iOS 13.
• Incorporate improvements from the macOS version.

12.0.6:
• Bug fixes and improvements.

If you like Letter Opener, please consider leaving a review. That helps us a lot. Thanks!

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## More apps by Letter Opener GmbH

- [Winmail Viewer - Letter Opener](https://appshunter.io/ios/app/winmail-viewer-letter-opener/id411897373)

All apps by Letter Opener GmbH: https://appshunter.io/developer/373066203

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-03.*