Motorola's Corporate Calendar (com.motorola.calendar) that is shipped with Froyo does not work.
I've tried completely removing it, reinstalling from the original package (version 1.1.1), the package is smaller than it should be, and once it installs it doesn't show the name (only shows com.motorola.calendar), or the icon, doesn't show in the app menu, no way to launch it.
I tried an older package I downloaded (version 1.0.4). The install went fine, and everything looks fine, but when the app is started it gets an immediate force close.