Moving in the right direction Rated 3 out of 5 stars
It does a good job of initiating and hitting all the settings for threaded views. However, it fails to include the "sent mail" folder (or it seems it has trouble with any time an email is outside of the inbox). This makes it a partial unfortunately. The concept of threading a conversation is for me to be able to put the message within ANY folder of that IMAP account and have it known where it is, but retain the linkage between them.Hoping there is an update soon to fix this. Great initial work!
edit: update. So it appears that if I am in "all folder view", the threading works as expected. However, when I am in "unified" view, the "master" inbox works correctly, however, the sub inboxes (those specific to a particular account) do not accurately thread the messages, and they are often missing pieces of the thread, not just from sent mail, but other areas as well sometimes. I've also noticed that at times it "threads" completely unrelated messages together that do not even have the same subject line or distribution list on them.
I appreciate everything the developer has done to date and am hoping they can work out the kinks to really bring it in line with Google's conversation view!