25 year old mac out-boots XP.

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xlsior

I mean a DVD just to install an OS nothjing else, no copy of microsoft office bundled with it
or perhaps it was 2mb over the cd limit? i see a dvd and see a potentila 5gb of data

Actually: The main reason for switching Vista from CD to DVD was that they now contain all different versions on a single disc. (home basic, home premium, business, ultimate

Thanks to that, they could offer their 'upgrade anytime' program. With 'upgrade anytime' you can purchase a new product key for a 'better' version of Vista than the one currently installed on your PC.
(e.g. upgrade Home Basic to Home Premium, or go all the way up to Vista Ultimate)

Your existing windows DVD will already contain the version that you just purchased: simply type your new product key and it can install/upgrade to the better edition.

(more proof: If you do a fresh Vista install and choose not to enter a product key yet, you have to select which Vista edition to install. You'll have to enter the product key before the activation time frame expires)