I bought my tibook (what's an icebook?) that came with OS X 10.0.4. I got my 10.1 update cd. What do you mean clean reinstall? With what? Reinstalling 10.0.4 and then update with 10.1 or is it actually possible to install 10.1 from the update cd? Or you are sayingI should _buy_ 10.1 full version?