Failure to Descend

[Frits van Bommel]

David B. Held wrote:
> Since Thunderbird threaded my last post into a 3-month old thread, [...]

That may just be because Thunderbird puts together posts with the same 
title into the same thread, even if the headers don't indicate it 
belongs there.
Apparently they got a lot of complaints when this behavior was removed, 
so they put it back in. See 
http://kb.mozillazine.org/Stop_threading_by_subject if you don't like it.

(This recently came up in another newsgroup with their weekly FAQ 
posting, which didn't contain such headers but still showed up as 
replies to the first such post in Thunderbird)