Windows Vista was developed under the codename Longhorn, and beta versions circulated in 2006 ahead of the finished operating system. This shutdown sound comes from one of those pre-release builds, which is why it differs from the cleaner shutdown chime in the final version of Vista. Collectors of operating system sounds and retro computing fans have shared beta sounds online for years, comparing builds and preserving versions that never reached most home computers. It remains in use today mainly as a nostalgic marker for mid-2000s computing, rather than as a mainstream meme.