What eldritch horror lurks behind Heathrow's information screens?

Airport departure boards are supposed to tell passengers where and when their flights will leave. Recent examples spotted by eagle-eyed Reg readers have offered some bonus information: a Windows activation reminder, dates from the past, and a glimpse of what appears to be Windows 7 beneath the signage software. Airport borks, it seems, are like buses: three have arrived in quick succession at Heathrow.