Reply To: winmail.dat
It’s useless to anybody but another Outlook user.
And in complete Microsoft fashion, it’s the default setting 🙂
This drove me nuts years ago when I was on a non-profit board. For the longest time I couldn’t figure out what was going on. When I did, I sent the guy a link to do what Nick said, but he couldn’t follow it – this was a computer users group 🙂 I think I eventually went around to his workstation and changed the settings (it wasn’t his PC it belonged to the organization). He was none the wiser and I could finally read the financial reports.
Another Thunderbird quirk that occurred in that same group was messages showing up blank (but you could still read it if you went to View Source). I traced that to messages labeled multipart/alternative that contain only HTML and no plain-text section, which seemed to only come from Blackberry users.