I have question/proposal about "Edit as New message". When I am using this option I expect that everything in my message is new except Body and Emails (Sender/Receivers etc.). Therefore in Thunderbird whole message's header remains unchanged. It makes, that in 'new message' email references stay, so when someone is grouping messages by threads, that 'new message' is part of old thread. In my opinion it is closer to "Reply as New message" feature than "Edit..." So, maybe that is thing that Mozilla team should think about: Remove references to other emails from header when using "Edit as New message" or create new option that will really make new message. Greetings, Pawel.