Thanks RealRaven. I don't personally need this at present, but I will keep it in mind. For the simple functionality of full-fields reply headers, I use the Add-on "Reply With Header". Without that I would not be using Thunderbird.I despair at Thund...
I hope the count of msgs in this thread are not being used to evaluate the desire for this feature! TB are now doing Exchange server connects so if you're wanting to tempt people across from Outlook etc then the full reply header needs adding in nat...