Article ID: 278061 - View products that this article applies to.
This article was previously published under Q278061
You receive an email message that contains a winmail.dat attachment. This issue may occur if all of the following conditions are true:
This issue is more common when the email message is sent to you over the Internet.
The Winmail.dat file is used to preserve Rich Text formatting. Outlook uses it when sending a Rich Text-formatted message. During transport, the content of the message may be changed, preventing the receiving client from being able to read the formatting instructions. In other cases, the receiving client does not use or recognize the winmail.dat file.
The data in a winmail.dat file is not usable. To resolve this issue, ask the sender to re-send the message in plain text format. The following methods can be used by sender to prevent sending Rich Text messages encapsulated in the Transport Neutral Encapsulation Format (TNEF).
Method 1: Change the default message formatThe sender can change the format of the email messages that they send by using the following steps:
Method 2: Modify the recipient's entry in the Personal Address BookThe sender can use the following steps to remove the RTF format from the recipient attribute in the Personal Address Book:
Method 3: Change the specific contact formatThe sender can use the following steps to set plain text in the recipient's contact record:
Method 4: Set the Outlook Rich Text Format Internet e-mail setting
For more information about TNEF, click the following article number to view the article in the Microsoft Knowledge Base:
290809For more information about Winmail.dat attachments, click the following article numbers to view the articles in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/290809/ )How e-mail message formats affect Internet e-mail in Outlook
(https://support.microsoft.com/kb/149203/ )Preventing Winmail.dat from being sent over IMC
(https://support.microsoft.com/kb/138053/ )How to prevent the Winmail.dat file from being sent to Internet users
Article ID: 278061 - Last Review: February 18, 2012 - Revision: 8.0