Winmail.dat files (also known as TNEF attachments) are special types of email attachment files sent by Microsoft servers. This article explains shortly how to open a winmail.dat file sent by email to you.
What is Winmail? Winmail.dat files are attachments sent by Microsoft mail applications (Outlook, Outlook Express or Exchange) in a proprietary format called TNEF (transport neutral encapsulation format). Being a non-standard attachment format, users from other e-mail clients (like Gmail or Thunderbird) or platforms (like Android, Apple, iPad or iPhone) cannot natively read them.An e-mail containing a winmail.dat attachment […]