If you receive an email with an attachment called this mail is To correctly receive this message, the sender of this message must convert the format. Open files directly from the web. Runs on Mac, Linux, iPhone, iPad, Android, Blackberry and all Internet conected mobiles. Online-Service to open or ATTdat files easily.

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Outlook will save settings in these instances, so you should delete the autocomplete entry or the contact to ensure that Outlook will respect the global settings. Already answered Not a question Bad question Other.

What is the winmail.dat attachment?

Changing this setting will ensure that new messages are sent as HTML by default. Cookies make wikiHow better.

Click and drag the winmail. When people send messages from incorrectly configured Microsoft Outlook email clients, a file attachment called winmail. This is usually referred to as Outlook RTF. Outlook has probably saved your Trello email address and is offering to autocomplete it when you start to type the address. 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 Bulletin.


Click on the File menu, and then click on “Options” Click on “Mail” in the left column, and under “Compose messages,” make sure “Compose messages in this format: The file is not recognized by other email clients. This file contains formatting information for how to convert a winmail.dat file to that use Microsoft’s proprietary TNEF standard and any attachments sent with the original message.

Compose a new email, and resend your content to the recipient. Thank you for your feedback!

Open attachments.

tto To view the contents of files with the winmail. Still in the Mail Options window, scroll to the bottom, and under “Message format,” make sure “When sending messages in Rich Text format to Internet recipients: How to convert a winmail.dat file to o Arquivo Winmail.

File Manipulation Email and Instant Messaging. If you’re using Outlook or earlier: If you’re using a company computer, you may need to consult your company’s IT group for further changes.

Contact the person who sent tto the winmail.

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Last updated on August 3, Was this article helpful? Can you tell us which parts were out of date so we can update them? What is the winmail. Include your email address to get a message when this question is answered.


Emailed attachments show up as winmail. Alternately, you can use a third-party online tool to view the contents of winmail.

Edit Article How to Open Winmail. Home Thunderbird How to convert a winmail.dat file to is the winmail. If you’re using Outlook, or Help answer questions Learn more. Outlook can be configured to use a proprietary encoding method that isn’t typically understood by non-Outlook mail clients. Even if your system is capable of displaying the file, it does not contain any useful information.

This add-on is not provided or supported by Mozilla and its compatibility with future versions of Thunderbird is not assured.

What is the attachment? | Thunderbird Help

This website will help you convert and extract the contents of the winmail. 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 Microsoft Support Bulletin.

If how to convert a winmail.dat file to try to open winmail. Follow the steps below to change your configuration: After winmwil.dat you will be able to see the contents of the winmail.