Pretty much giving up on the Apple BT mouse. 1 button is such a step backwards. Transferred everything over to new iMac G5 and decided to plug in Msft. mouse. Thumb buttons no longer work. Went to preference pane and it said s/w needed to be reinstalled. Located CD and it said software was already installed. Removed all traces of it (including old System Folder that the FW transfer provided) and the software still says it's on my PC. Help. I can't live without a back and forward button on mouse for Safari.