Iain,
> I've just subscibed to a load of new newsgroups, and it looks to me
> (with NS6) that I have to change them all individually to view threaded.
> Is there any global option for this? (Or does Mozilla do it now?)
>
> If not, perhaps it might be a good idea. It might be wise to have
> different options for mail and news servers, since I usually want mail
> in strict date order, while I like to follow newsgroup threads. What do
> you think?
Yes, this is how 4.x did it.
It was fixed a while ago.
see http://bugzilla.mozilla.org/show_bug.cgi?id=32249
-Seth