1. There's no longer a proper toolbar for the main window. (You can sorta-kinda get something that's like it - but not quite, and it is extension-hostile, i.e.

1. There's no longer a proper toolbar for the main window. (You can sorta-kinda get something that's like it - but not quite, and it is extension-hostile, i.e. won't let you overlay it). This is doubly problematic with the menu bar being hidden. 2. No multi-folder selection. This is necessary for actions involving multiple folders - from a simple move to extension-enabled actions like "Search these folders for duplicate messages")