Knowledgebase: Technical Help
Why there is an attachment called winmail.dat included in the received mail?
Posted by - NA -, Last modified by Tomas Zubov on 05 June 2014 11:23 AM

Why there is an attachment called winmail.dat included in the received mail?

Applicable only with Outlook 2007 and older versions

This is a feature of older versions of Outlook and Outlook Express. The winmail.dat file contains data to preserve message formatting. It applies only if e-mail is sent in RTF format (Outlook Rich Text format)

Further details can be found in the Microsoft knowledge base at http://support.microsoft.com/default.aspx?scid=kb;us-en;278061