Recently I had an important email chain going with a client. At one point I started to respond but then stopped. It ended up labelling itself as a draft on my mobile device. I then discarded/deleted the draft and it removed the entire email chain. Not in drafts, trash or archive folder. Completely gone. This "glitch" needs to be fixed as it is unacceptable for a company that's been around as long as Yahoo. I have attempted to use the restore email function on the site but no luck so far.