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Active Directory 2003 to 2008 Upgrade/Migrate

I have read about the scenarios where you can upgrade AD2003 to 2008, but on those scenarios, they talk about preparing the forest and domain on AD2003 and inserting the DVD in the DC2003 and do the upgrade.
Well, if my existing DC2003 are all 32 bits, and I want to install Windows 2008 DC on 64 bits hardware from scrath , but replicate, later on, the database from DC2003 to 2008, how can I achieve that ?

I believe the long way to do it, is install DC2003 on the 64bits and do the upgrade, but I wonder if there is shortest way? just replicate the exiting Active Directory from 2003 (32bits), to the newly built windows 2008 64 bits?

Any help will be very much appreciated.

Thank you
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The hardware in which the DCs2003 are installed on, supports only 32 bits, and the new hardware where windows 2008 server is installed on is 64 bits.
how can I upgrade DCs2003 (32bits) to DCs2008(64bits) ?

I understand that you still can insert Windows 2008 DVD in DC 2003 and use ADprep32..., etc..
but after then, at some point you will have to invoke the upgrade option while the windows 2008DVD is still in DC2003, that might not let you upgrade the 2003 OS 32bits to 2008 OS 64 bits, since the Hardware does not support 64 bits.
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Thank you