I don't seem to be able to repeat this, but this happened to me this morning: drafted a [richtext] reply to a message in the middle of a multiitem conversation. Added Bcc'd recipients. Saved the draft "A", quite a long one, btw. Decided to wait with sending it until later. Opened up Inbox, did other stuff for a time.

After a while came back, drafted a second, short reply to another message in the same conversation. Added a single Bcc recipient, sent it off [do not remember if I saved draft "B" before that]. Message went on its way, but draft "A" disappeared alongside with it. No trace of if anywhere. Needless to say, I'm quite pissed, since I thought I had a copy of the text in the draft "folder" and now I do not…