I have just realised that Lion only works on Core 2 Due Mac's, I'm not sure, but I think my Mac at home is a Core Due 4.1, although it could be a 5.1/2. I am also MobileMe customer, am I right in saying iCloud only works with Lion? So not only can I not upgrade, I also will no longer be able to sync my iPhone with my older Mac. This sucks !!!