Windows Longhorn was the codename for the project that eventually became Windows Vista, and its leaked builds and concept features attracted a large fan community online. That interest led to many fan-made sounds presented as authentic beta audio, including this shutdown chime credited to Not Microsoft. It spread through soundboards and OS customisation forums where users collected startup and shutdown themes. It remains popular because it captures the polished, ambient style people associate with that era, even though it was never an official Microsoft recording.