I hope this isn't in HTML - please alert me if it is; I don't know if fedup changed the mail setup, and forget where Thunderbird's check-box is to fix it.
I'm just curious as to how to fedup when F19 comes out; I am aware that the command is
fedup F18->F19
however, this is the beta as opposed to F18. Of course, F18 is available to boot into, and I guess users boot into that to use the command above. I suppose I answered my own question.