Winmail.dat – Microsoft Hell

Microsoft WindowsHave you ever received a “Winmail.dat” attachment?
I have clients who send files like Word or Visio via email but all I get is a “Winmail.dat” file. Argh! This issue is only like ten years old… Thanks Microsoft!@

When you receive a Winmail.dat file in place of an attachment it means the sender is using Microsoft Proprietary email formatting in their Outlook or Outlook Express email client or their outgoing Exchange email server is set to do so. Usualy the culprit is the senders MS email client is set to send email in RTF “Rich text” format.

You can either tell the sender to resolve this issue on their end (RTF is silly, they should be using Plain Text or HTML anyhow)


You can do the work Microsoft has placed at your feet and run one of these app / solutions:

Online service to decode Winmail.dat


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