Hi Robert,

... You just have to enable it (e.g. press Alt-V,V,G).
WOW! That's great: it's exactly what I wanted, and to think it was right
under my nose all these years.

Of course, using your guidance, I clicked on View | Current View | Group
Messages By Conversation to toggle that option because I'd never remember
that key sequence.

Alternatively, you could leave that option alone (so you don't
accidentally
confuse yourself with other Local folders eg) ...

I did notice, as you hinted, that electing that option in any local folder
or file applies it to all locals. I checked other Local Folders with that
option elected but I didn't perceive any difference my InBox, which is the
only other thing I care about (slightly: I mainly use FireFox for browsing
and WebMail for email.)

HTH

Sure did!

Regards,
Richard