Letter Opener
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Letter Opener. The best way to open Winmail.dat, MSG and EML files.

The best solution for opening e-mail files comes on the web. A new way to seamlessly view e-mail files without requiring an App download.

Open E-Mail Files easily and securely

Letter Opener has always been the perfect app to open and view Winmail.dat and MSG e-mail files — the format used by Microsoft Outlook and Exchange — and also Internet Standard EML e-mail files. And it’s an even easier and more secure with Letter Opener for Web. Your files are never transferred or shared when you use Letter Opener for Web, and your files and content stays protected on your device.

Desktop-Class E-Mail viewing

Modern web standards enable us to provide you a rich e-mail file viewing experiences in the browser.

Privacy and security

Privacy and security aren’t just something you should hope for — they’re something you should expect. That’s why we never transfer or shared your files. Everything is done on your trusted device. Your emails stay your business.