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To download Winmail.dat Viewer - Letter Opener Lite from the Mac App Store, you need a Mac with OS X 10.6.6 or later. Learn More.

Winmail.dat Viewer - Letter Opener Lite

By Atlan Creative GmbH

Open the Mac App Store to buy and download apps.


Letter Opener Lite - Open winmail.dat, .msg and .xps files.
• Browser attachment of a winmail.dat file like other attachments
• Preview of winmail.dat using QuickLook
• Convert nested messages
• Convert Schedules, Appointments and Task for iCal
• Convert Contacts for Address Book
• Convert Notes
• Convert Delivery receipts and read receipts

Please refrain from sending your bug reports or feature requests using the App Store. Instead, to ensure a direct response from us send them to We’re always happy to help our users and receive their comments!

What's New in Version 3.0.1

• Microsoft Outlook MSG file support
• Microsoft XPS file support
• Filename Extension Repair

Also this update includes reliability improvements.


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Customer Reviews

Taylors” 21st.

I have never used this app. before but was receiving all these photos” concerning my sisters” events and she could not open them, so I went to my GREAT apple school and found out just what I needed to know, it is great to use, and I just sent them over to her, very simple!!!!!!!Now I have just another method to choose to use!!!!!Made me feel little a smart !!!!!!

It works

Never could get to the bottom of why some senders' attachments arrive in .dat format sometimes. If you don't want to, or can't, work through a solution together with the sender(s) just get this app. It has worked flawlessly for over a year. I appreciate just being able to drag a .dat attachment to Letter Opener Lite in my dock.

A MUST for any Mac user. Works effortlessly!! So straight-forward. Saved my life many times.

Seriously, this App. is powerful, free for basic features and allows for some nifty upgrades that make sense to purchase if you want some higher function to it. OH and check out their iPhone version, too. A MUST for any Mac user.

Winmail.dat Viewer - Letter Opener Lite
View in Mac App Store
  • Free
  • Category: Productivity
  • Updated:
  • Version: 3.0.1
  • Size: 6.9 MB
  • Languages: English, Dutch, French, German, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish, Swedish
  • Seller:

Compatibility: OS X 10.7.5 or later, 64-bit processor

Customer Ratings

Current Version:
All Versions:

Top In-App Purchases

  1. Winmail.dat Premium$9.99
  2. MSG Premium$9.99
  3. XPS Premium$5.99
  4. File Extension Repair Premium$4.99

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