Just to let you know, a few of your email replies are missing the commonly
used prepended subject "Re: ".

This makes it a little strange for threading and also it makes it appear
that your message is the original (first) posting and not a follow-up.

I am assuming your VM 7.07 (in Emacs) can prepend this "Re: " to your
subject. I believe this is done with the vm-reply-subject-prefix setting.

Maybe in your ~/.vm file add:

  (setq vm-reply-subject-prefix "Re: ")

And maybe to so replies will be matched with original:

  (setq vm-subject-ignored-prefix "^\\(re: *\\)+")
Or to work with numbered Re's too:
  (setq vm-subject-ignored-prefix "^\\(re\\(\\[[0-9]+\\]\\)?: *\\)+"

You could also check for "AW:" too:
  (setq vm-reply-subject-prefix '("Re: " "AW: "))

Of course, we could argue that the threading should just be done by date
or by using the References and/or In-Reply-To headers instead.

   Jeremy C. Reed
   http://bsd.reedmedia.net/