MSN Messenger was Microsoft's hugely popular instant messaging service during the early 2000s, and its contact-online chime became one of the most familiar sounds of that era of home computing. As users moved to newer apps and the service eventually closed, the sound survived in nostalgia videos, reaction edits and meme soundboards, where a single chime instantly signals the early internet. It remains popular because it is short, instantly recognisable and tied to a shared memory of waiting for friends to appear online.