I seem to recall that those buttons can no longer be programmed since a certain OS X update. I don't think Microsoft has updated the Intellimouse software since that time. On 2/2/05 6:34 PM, David Glassman <dag44 at comcast.net> wrote: > I just upgraded to a new g5 iMac 20", 10.3.7, and moved all my files > and settings over to it. When I plugged in my wireless MS Intellimouse > Explorer it was immediately recognized and worked ...partially. The > left, right and scroll worked fine, but the back and forwards buttons > did nothing. > > I uninstalled the old software, downloaded and installed latest > (Intellimouse 5.1), but still no recognition of the buttons. > > The Intellimouse control panel shows a big red X through the > illustration of another model of mouse. There are no menus for the > back and forward buttons. > > I've now made multiple attempts at this without success. MS website > doesn't recognize the product ID number it asked for to provide me with > email support, so I can't get help from them.