Using Outlook for iOS for personal email and calendar management
It's a workaround, but very ugly.
https://www.reddit.com/r/Outlook/comments/1m3bu2o/folder_notifications_on_ios/
My workaround : a rule for every email I want to put into a folder, with COPY email into the folder, instead of MOVE email to the folder. So i get notified. So you keep deleting the emails on the inbox and marking the copies as read? yup. kind of boring but at least i get all notifications and e-mails are in the right folder (2 main criteria)