dat appears as an attachment with some emails. It cannot be opened and so appears useless. What is the point of winmail.dat? Where did it come from?
Microsoft Outlook creates the winmail.dat file to contain an email’s formatting information. The file is created only when a mail program or browser cannot read an Outlook email. The file attempts to keep the email’s original formatting intact. If both the sender and receiver use Microsoft Outlook, the winmail.dat file should never appear. If you get a winmail.dat attachment, don’t panic-just ignore it. It does not do any harm. It does not take up any disk space of concern.
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