MSN Messenger launched in 1999 as Microsoft's instant messaging service and became a defining part of early 2000s online chat, later rebranding as Windows Live Messenger before closing in 2013. Its short incoming message tone was heard daily by millions of desktop users alongside contact sign-ins and nudges. As clips, edits and nostalgia posts revived the interface online, the alert survived as a standalone meme sound. It is now reused in videos and streams whenever a creator wants an instantly recognisable retro notification moment.