This is a task I have that I really don't have a clue how to handle.
My boss has a folder of e-mails and he just wants to keep the last e-
mail from the conversation. Sounds easy enough, just filter on the
conversation and sort by date. I could run some code to delete all
but the last one.

However, sometimes a thread branches out into multiple threads, but
the conversation stays the same. He may send an e-mail to three
people and then hold conversations with each person. Those threads
could even break into different conversations with other people, but I
believe the conversation field would stay the same.

I'm picturing the a tree, where the trunk is the conversation, but
each branch breaks off into more branches and maybe the final e-mail
is the leaf. I need something that collects all the leaves-- I need a
leaf catcher.

Is there a way to do this?