Read mail dat files and convert attachments, with Winmail dat reader
Winmail.dat Reader lets you handle winmail.dat email attachments. The interface is simple and does not include command line options.
The program lets you view the body and subject of messages. First save the attachment to your hard-drive, then open it through the Reader.
Winmail.dat files are TNEF attachments (transport neutral encapsulation format) sent by Outlook or Microsoft Exchange.
Other e-mail clients need a special application like this Winmail.dat Reader, to use Winmail.dat files.