having used groups since before it was even officially released to do “support”/“sales” there are a few things we’d like to see in Discourse to vastly improve the experience:
Search by subject/body and email address (esp for archived posts), this lets us find old posts.
Moving/merging posts: Sometimes when someone replies they use the To: email address instead of the Reply To: email address. When this happens I usually forward the mail manually, but it would be great if I could easily “add” it to an existing post.
Of course as always, these are just suggestions to improve discourse.