humm, my wireless optical USB mouse works in OS 9.2.2. i wonder why That Apple USB optical mouse dont work in OS 9.

BTW have you ever tried USB overdrive

http://www.senlick.com/html/01.01.html

but you should not need it to get that to work

i wonder if you have all of the USB extensions installed that needs to be installed. cause that sounds like the case. cause it should have no problem working.

that is the same mouse my uncle has for his iMac G3 233mhz running OS 9