From: "Frank Haber" 

>able to install XP on the Mac using the slipstreamed CD with XP SP2.

Maybe.  Let me add one more piece of uncorroborated hearsay into the mix. 
You have to use a retail code, because the upgrade codes require you insert
another CD into the drive mid-install, and..... (it's a Mac, and even the
paper clip no longer works).

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