I am having issues when having email conversations with more than one contact via the Conversations page. Many times, if I send an email with a CC to two contacts (we'll call the primary addressee Contact #1 and the CC Contact #2), and Contact #2 replies, it shows in Contact #1's Conversation window, but even though Contact #2 Replied All, when I go to reply it only sends to Contact #1.
I think this could be fixed by creating a NEW conversation named "Contact #1, Contact #2" that will track the group conversation separately from Contact #1 and Contact #2's Conversation.
Another option would be when Replying, to be able to add CC/BCC after clicking Reply to verify it is sending to all the desired addressees.