hm... well like i said, i have MS mice, optical explorer trackball and just optical explorer both with 5 buttons... but the MS software doesn't have the option of making a button the old skool "middle button" as for the serial mouse, it's the only one i have on hand that is a true 3 button mouse (not a scroll wheel button for the 3rd) , however, i do plan on trying a PS2 one later today when i can borrow one from a friend. Anyone else have a suggestion? the serial mouse i'm using is totally generic and i tried to use 3 button mouse drivers for some of the lesser known brands, but they wouldn't work...