> > Wouldn't it be more appropriate to ask why Thunderbird can process said > email from that > users' settings (outlook) and mutt cannot, rather than asking the sender > to change something in his settings?
The sender's settings are pre-MIME. MIME is a set of Internet mail standards that has been around in some form for nearly 20 years or so. Look up mailcap settings for application/ms-tnef, but in my personal opinion, this sort of thing should be discouraged.
