How to Disable Contacts Sign in Sound Alert and Online Popup in Window Live Messenger While using the Window Live Messenger, whenever an user sign in or sings out of messenger service, it will pop up an alert over the system tray or notification area along with sound. This alert informs us that the contact has recently signed in or signed out. The user signed in or signed … [Read more...] about How to Disable Contacts Sign in Sound Alert and Online Popup in Window Live Messenger