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When sending messages from email clients that use the Microsoft Exchange server, a file attachment called winmail.dat may be added. Learn how to prevent this.

Messages sent from incorrectly configured Microsoft Outlook/Exchange email clients may contain a file attachment called {filepath winmail.dat}. This attached file contains formatting information for messages that use Microsoft's proprietary TNEF standard, plus any attachments sent with the original message. The TNEF file is not recognized by other email clients, so any attachments sent with the original message are not displayed in Thunderbird's message pane. If you try to open {filepath winmail.dat}, you will probably be prompted to specify the application that should be used to open the file, unless you have an application installed that can decode this file and display it. Even if your system is capable of displaying the file, it does not contain any useful information. To prevent this file from being attached to messages, the sender of the message (or their system administrator) can configure various options as described in this [https://support.microsoft.com/help/278061/ Microsoft Support article]. {note}'''Note:''' There is also a Thunderbird add-on called [https://addons.thunderbird.net/thunderbird/addon/lookout-fix-version/ LookOut (fix version)] which decodes the TNEF attachment ({filepath winmail.dat}) and displays the original attachments in Thunderbird's message pane. This add-on is not provided by or supported by Thunderbird and its compatibility with future versions of Thunderbird is not assured.{/note} '''The best solution''' is to contact the message sender and inform them that their copy of Outlook is incorrectly configured as suggested in the Microsoft Support article.