Apple to developers: Update your old apps, get more downloads, or it's gone from the App Store

Everyone has a favorite iPhone app that just hasn't been updated in a while on the App Store. We've all probably noticed its lack of a refresh at some point, but as long as it still works perfectly...what's the big deal, right?

Well, it's a big deal now. Over the past week, Apple has sent "App Store Improvement" emails to some...