A standby console could still listen for mail
The Wii’s message light depended on WiiConnect24, a feature that let the console receive certain online updates while it was in standby. Standby was not the same as unplugging the machine: with the feature and network connection enabled, the Wii could stay reachable without displaying a game or menu on the television.
That made the console’s disc slot more than a place to insert a game. Its blue light could signal that something had arrived while the Wii was otherwise quiet. The glow turned a hidden network event into a visible cue across the room.
The light marked an unread notification
The message itself waited on the Wii Message Board, where players could read messages and manage other console notices. The light was a notification, not a display: it did not show who had written or what the message said. Turning on the Wii brought the notice into the system’s menus, where it could be opened and cleared.
That small design choice suited a living-room console. A computer might announce new mail on a screen; the Wii could signal from its own hardware, even when the television was off. A blue glow in the dark meant the console had something waiting for you.
