Some boxes are a TV Guide solution, and others might have the ubiquitous TMS service.
For what it's worth, our TMS-supplied guide data has never changed...though EE does show every Wednesday now. It's really wrecked...First Outlook, YWT, WeatherCenter in 3 hour increments (except for EE 9-10 on Wed.), The Weather Classroom. Last updated 2001, I'd think. The Zap2It guide (also a TMS supplied service) is current with long-form shows. (It does have the old logo for the channel logo, though.)
With EE exiting stage left on Sunday, it'll be really out of whack.