Folders for Smart Folders
I think it would be very useful to have Folder in which you could place Smart Folders. ie. One Folder would contain Smart Folders that related to investment. One Folder would contrain Smart folders related or Family etc.
After being a long time Mac Mail user and switching over to Outlook this is one simple but very useful feature I miss.
iCloud syncs mail smart folders across devices, please do the smae with outlook smart folders