This chime is the default new-mail alert built into Microsoft Outlook, the email client used in offices, schools and homes around the world. Because so many people hear it throughout the workday, the short tone has become instantly recognisable as the sound of an email arriving, even outside Outlook itself. Online creators now lift it from its original inbox context and use it in videos, streams and edits to stand in for any incoming message, notification or reply, which keeps it useful long after its first use as a simple desktop alert.