In Pictures: The good, bad and ugly history of Mic...
Microsoft released the IntelliMouse at the end of 1996, using it as a platform for a variety of mice showing off truly innovative features. You can thank the IntelliMouse lineage for the scroll wheel, the optical sensor, forward and back buttons, modern ergonomic designs, and the trackball design. The last IntelliMouse Microsoft made was the Explorer 3.0, which was recently discontinued.
In Pictures: The good, bad and ugly history of Microsoft hardware