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What is winmail.dat that someone sent me in my email?
Keywords: email outlook winmail.dat
When someone sends me an email it contains an attachment called winmail.dat in place of the intended attachment. I cannot open the attachment.
WINMAIL.DAT is a proprietary Outlook file that allows Outlook users to send Transport Neutral Encapsulation Format (TNEF) information
To Specify Mail Format in Internet Mail Only Installation
Global Change
To turn off TNEF:
On the Tools menu, click Options, and then click the Mail Format tab.
In the Send in this message format list, select Plain Text or HTML, and then click OK.
Per Message Change
To turn off TNEF:
Open the message.
On the File menu, click Properties.
On the General tab, clear the Send in Microsoft Outlook Rich Text Format check box.
If your default mail format is HTML or Plain Text, you will not see the check box. Per message control of TNEF is only available for Rich Text Format messages.
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