Windows Live Messenger was Microsoft's popular instant messaging service of the 2000s, evolving from MSN Messenger into a daily way for friends to chat, share photos and set status messages. Its contact online chime became instantly recognisable to a generation who kept the program running in the background at home and school. After the service was discontinued in the early 2010s, the sound lived on in YouTube nostalgia videos, memes and retro edits, where a single chime instantly signals the dial-up and early social internet era.