Macworld At a glance Expert's Rating Pros ・Sturdy, comfortable design ・Horizontal and vertical scrolling wheel ・Programmable ...

Computer mice often have scroll wheels or multiple buttons. The middle-click function works as a shortcut in many programs; here are some tips for using it.

It could be due to wear and tear, or it could be due to something else. Before you buy a new mouse straight away, here's what you can try to fix it.