MSN Messenger, launched by Microsoft in 1999 and later renamed Windows Live Messenger, became the default chat app for millions before smartphones. Its contact online chime from the 1999 to 2001 era was heard daily in homes and internet cafes. As Messenger shut down in 2013, clips of its sounds spread on YouTube and meme pages as retro shorthand. Today it sits alongside the modern Discord notification and a classic ding sound effect as an instantly recognizable alert, used whenever creators want an early internet feeling.