put back the ability to have a folder open when dragging an email and hovering over it
put back the ability to automatically open folders with multiple sub folders simply by dragging an email from the inbox and hovering over the destination folder that contains the sub folders...
Add an option to see which email a message is sent from instead of having to go into contact details to figure it out. I get emails from the same contacts, but from different emails, and finding out the details is a pain. A simple hover preview of the sender and the recipients would do.