Interesting. I installed build 5744 of Vista Ultimate on a machine at work about a week ago, to let people get to understand and play around with Vista. No Aero interface, no glass or flip 3D. The features that people most wanted to play with were not there. I looked at the specs of the machine again, 512MB RAM. Forgetting the age of the machine. So going across to another spare machine, I borrowed another 512MB out of there to switch all the effects on to play with. All worked well and people were strangely impressed by effects that Macs have had for years. Anyway, 4 days later and I needed to put the memory back in the other machine. Back down to 512MB. Oh well, we've seen how it all works and learnt a fair bit. I went back to the Vista rig and glass was still there, in fat it hadn't changed at all, just got a bit slower. I set up another user to try parental controls for the internet, (to restrict web access on new display models without pass-wording them), and I could not switch it on in the new account. Conclusion, Aero doesn't need 1GB of RAM to run, merely Vista requires 1GB of RAM in order to give you the option to switch it on. While I'm Microsoft aren't the first to do something like this, and I'm damn sure they won't be the last, surely if a user has plumped for Home Premium or above and has lower specs, it is their choice if they want their system to run slower because of Aero, even if it also transpires it makes it more unstable. Microsoft, reveal your true motives.