OE sorts trees by subject line, but if the subject line changes, you get a
new tree root if read files are hidden.

Right. This is what happens with Netscape too.

I really don't see a way to resolve all of the possible ways that readers
deal with thread headers into a universally consistent practice. Someone
will always come up with an app that does something wacky.

Right. But if posters avoid following a prepend with a colon, this
issue won't be an issue.

Jose
--
There are two kinds of people in the world. Those that just want to
know what button to push, and those that want to know what happens when
they push the button.
for Email, make the obvious change in the address.