Notification visibility on Windows <10
Apparently in Windows 10 there is an area that permanently keeps your notifications. On Windows 7 (+Vista7/8?) there is only a temporary popup, and after that there is no way of knowing of new messages, except opening the main window.
The additional behavior I would expect is that the main window is being opened minimized to the task bar and flashing, but at the very least having a little red notification dot on the tray icon.