Windows Live Messenger (previously known as MSN Messenger) will pop up an alert dialog above the notification area or system tray whenever another IM contact or user signs in or signs out of the Messenger service, together with a sound. The alert notifies that the user has just signed in or has just signed out. The contact online or offline alert pop up will automatically … Continue reading Disable (Turn Off) Windows Live Messenger Contacts Sign In Online Popup and Sound Alert