You have received a message by a conjectPM project and instead of the expected attachment you get a Winmail.dat file as attachment to the message. Hereby it is a problem caused by Microsoft Outlook and its rtf-file type. It occurs in rare cases.
Microsoft Outlook is normally set up on Microsoft Exchange Server. They communicate to each other before sending Emails. If you send a mail in rich-text format (RTF) the recipient could receive the mail which contains a winmail.dat file which covers the original attachment.
According to Microsoft it will not happen if the sender in Microsoft Outlook is going to change the Email format to plain-text. In this case you will see the original attachments and not a winmail.dat file.
To avoid the problem we recommend changing the Email format before sending with an attachment into plain-text format. The screen blow shows how to realize that in Outlook 2013.
In other Microsoft Outlook versions the settings may differ.
If you have any questions on Winmail.dat, please consult your internal system administrator. You will find also more information at Microsofts' Homepage. Please use the link below to read more about the problem.