Solve the Winmail.dat Problem with Letter Opener – Sponsor

These days there aren’t many friction points left when working on your Mac with Windows users. One, however, that still gets me is the dreaded winmail.dat files. If you ever work with Windows users, you know what I’m talking about. These are windows formatted Microsoft Outlook email attachments. It seems that everyone on Windows sends them to me and the Mac has no idea what to do with them. 

Last year I finally found the right app for dealing with winmail.dat files, Letter Opener, and I’m pleased to welcome Letter Opener as a new sponsor at

Letter Opener converts and displays the content of winmail.dat files automatically inside macOS Mail so that they appear just like any other email. You will never have to think about winmail.dat attachments again. Letter Opener is fully localized in Arabic, Cat, Chinese, Dutch, French, German, Hindi, Italian, Japanese, Korean, Portuguese, Russian, Spanish and Swedish.

I know I’m not supposed to say this, but Letter Opener just works. Since installing it, I’m barely even aware of receiving winmail.dat files because everything is taken care of right in Apple Mail. And for you mobile warriors, there’s also an iOS version.