Third button has been "hidden" below the mouse wheel for well more than those 10 years, just press the wheel down and you'll hear a mouse button click.

Remember Xerox PARC, the people that developed the first computer GUI?

https://archive.is/sKLL

> The three button Alto mouse enabled the first bitmapped and overlapping windows display, known as a graphical user interface (GUI). The Alto dates to March of 1973

My dude, my mouse has 5 buttons. No idea what you're talking about here.