I have a 10yr old G3 iMac, running X.3.9 and Classic, have 192mb memory and 105GB free space on HD. My question is what is the latest OS version I can install. I know I will need to add more memory but thats not a problem. Machine runs good, sometime slow with a lot of beachballs but dosen't freeze up or crash. Need newer OS so I can download some files I want and plan to get into the 21 century early next year with a new machine, if they release a new generation of the iMac or come out with a notebook with a numerical keyboard. Of course depending on the price of the software I may just bite the bullet and hold on to what I have till spring.