Installed Mac OS X 10.4 on my older Emac computer and can say that it has made a key difference in the usefulness of this computer. With the old version (10.3) I was not even able to use Facebook efficiently. When trying to watch videos on Youtube, my browser would crash. All of this has been resolved and my computer, which I purchased used for a fraction of the price it would cost to get a new one, is now sufficient for most of what I like to do with it. However, if money is not an issue, I would highly recommend to simply replace an old computer with a new one that features the latest technology. The computer I am using is based on a Power PC processor and it appears to be hard to find any useful programs for it today.