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I think the footprint would have been loosely connected the the minimum requirements. many would say that the minimum requirements are very optimistic for any of the Windows OS minimums, I mean they say you can run XP on 64MB of RAM. Yes you can but its like walking through treacle.

If you have the RAM footprint isn’t much of a problem, bearing in mind everything else that you run is going to add to that footprint and the overall minimum RAM requirements. It would be difficult to come up with a footprint just for vista alone when there will be so many different set-ups and different running programs (firewall, anti-virus, etc.), no one is just going to boot Vista and nothing else.