I am currently running Vista build RC1 without any problems. It will eventually (so I understand) expire May 2007. Does anyone know for sure (no opinions please) what the upgrade rules are if I were to buy an £69 OEM copy of MCE 2005 that includes a £4 upgrade to Vista Premium from somewhere like *buyer.co.uk? That way I would have Vista Premium for half the £150 retail price. From what I can read it looks possible..