[hendersoon]

Windows Media Center is a discontinued product. Best case scenario, it'll be supported until 2023 when Windows 8.1 ends extended support. But I'd be pretty surprised if MS is still sending guide data that long. More likely, one day you'll turn it on and discover it doesn't work any more.

[drewmol]

You can use a paid service like schedulesdirect to replace windows media center guide data, which they get from Rovi (Tivo parent) currently. It tends to be more detailed and accurate that way.