Stock MacOS X supports the MacAlly Two-Button ADB mouse only as a standard mouse, thereby robbing the operator of the use of the right button. This driver places the mouse in MacAlly proprietary mode, enabling the right button.
This review was originally posted on VersionTracker.com. I have the macally two button mouse driver for OS 9 classic but in OS X 10.2.6 only left button works, until MacAllyADBMouse-Mac OS X. Works Great!!!
For those still using ADB Mouse in OS X with only one functioning button, MacAllyADBMouse - Mac OS X is the answer. Thanks...