I have an older computer (new in 2007) that lost the ability to use its serial mouse some months ago. Fortunately, a friend who is knowledgable in computer technology had a spare wired optical mouse that uses an USB port which she gave me. This mouse started dying and it was clear the time had come to find another before it failed completely. The present Microsoft Optical Mouse has been a perfect replacement right out of the box. I am very happy with it.