I would like to request mbox opening from cloud providers and if possible EagleFiler integration. I use EagleFiler for file organisation an backup purposes. It is able backup email folder from ones accounts. This can be done to either mbox or eml. EagleFiler only allow editing of files keeping the same name if using the mbox with another program. New files and folders can be added to the library but not deleted, moved or renamed externally or not from within the app. (This is for indexing reasons, but you can always rebuild the index). I would be happy with just eml support to view old archives.