What serial number from CS3 does CS4 want?

I'm upgrading from CS3 Production Premium/Windows to CS4 Design Standard/Mac. I have the email from the CS3 order (it does not show up anywhere in my order history on adobe.com, I don't know why) and I have 3 serial numbers. 2 are 6 groups of 4 numbers, and 1 is 6 groups of 4 numbers with 4 letters preceding them. None of these work when I enter them into the CS4 install dialog.
Also, I was unable to deactivate CS3... the option was grayed out.
I'm guessing my next step is to call Adobe, but I thought maybe someone here would have some advice also.

Mac CS4 wants a Mac CS3 serial.
You can't do what you tried, it does not work.
If you are moving to Mac you need to get a crossgrade. This includes a letter of destruction of the Windows software then Adobe will send you the correct software to install on your Mac.
Only Customer service can help you.

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