Currently they are working strange - as left/right keys - so perhaps it's even a bug??

Moderators: helmut, XnTriq, xnview
Tech ARP: Microsoft IntelliMouse Optical Reviewxnview wrote:What is "The mouse side buttons to go back and forward"?? There is special buttons for that?
Microsoft Product Information Center wrote:Two new customizable function buttons: Browse the Web without using toolbars or the keyboard. Simply use either side button to go forward or backward on the Internet. Or, you can program the buttons to execute routine actions in many of your favorite programs.