Yeah, this also means Logitech is on the way to being a major polluter. We have to assume that all of these billion mice are not still in use. Many are presumably outdated and replaced with newer mice, as things like scroll wheels, optical mice, etc., where introduced over the years. So what's happened to the mice that people don't use anymore? Does Logitech have a program to collect them? Or are they just going into landfill, with all the toxic bits generally associated with electronics? Mice must really be up there with cell phone chargers as one of the ubiquitous devices people that people end up with piles of and which are a hidden environmental disaster.