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You can, using the DNG converter with the appropriate compatibility setting.
But you should know that the ACR engine has travelled light years since then, in terms of image quality. Process 2010 brought vast improvements in noise reduction, and the current Process 2013 expands the useful dynamic range enormously through the Shadows/Highlights controls.
Among a bunch of other things.
I really couldn't imagine going back to Process 2003, which is what you'll be stuck with.
I suspected the ACR bundled with CS2 was primitive, now I know exactly where.
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What operating system are you using?
If your using windows you can use this plugin:
Of course as others have stated, if you can afford $10 a month, photoshop cc and acr will give better results than cs2's acr.