My parents have a 400MHz Graphite iMac, and recently their puck mouse gave out on them. Dad bought a Microsoft Wheel Mouse Optical, one of those white-and-grey chimmerjigs.
Anyways, it doesn't work on the keyboard USB ports. Plugging it into the side port will let the mouse "light-up" fine and be ready to go, but neither side of the keyboard will work. Furthermore, the new Apple clear mice seem to be fine with those ports.
Anyone know of a possible problem? I don't know anything about Microsoft mice, and haven't had any problems with the Razor Boomslang I have....
greg