Just got a Microsoft Mouse 4000 for Christmas. I used to have a different model (I'm not sure which, though I know it had both side buttons). While it had to be refreshed every time, I could assign different buttons. I also have parallels, and the mouse worked great in parallels (even when gaming on the PC side). I put the 4000 in; the Mac recognized it, and the two main buttons work, but Intellipoint doesn't recognize it. I can assign buttons to do different things, but it doesn't affect the mouse because my mouse isn't hooked up. I also went into Windows and started gaming, but the mouse was glitching like crazy! It was leaping all over the screen. So is there something I'm doing wrong, or is Mavericks just not supported for it? If it's not a suitable mouse, does anyone have suggestions for an affordable mouse? I searched online for a good while, and couldn't find a thing that answered my question. I tried uninstalling/reinstalling Intellipoint (reboots included).