And it can be opened by Microsoft mail clients only.įor users who don't use Microsoft mail clients, a 3rd party Winmail.dat opener will be needed to view its contents. Therefore, a Winmail.dat is a file including the email subject, recipient, sender, message body and attachments with good formatting. However, if the email recipient is not using Microsoft Outlook, Outlook Express or Exchange, the email will be wrapped in a Winmail.dat file. When composing emails in Microsoft Outlook, Rich Text Format is applied to maintain the formatting. Extended: How to Open Winmail.dat Files on iPhone/iPad?.3 Top Third-Party Winmail.dat Viewer for Mac.The Best App for Opening Winmail.dat on Mac.
