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
jskfanAsked:
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convergintCommented:
You need to prep the 2003 domain first no matter what unless you are going to rebuild the domain from scratch.

On the 2008 R2 disk, there is an adprep32.exe file you can run to upgrade the 32 bit environment.

This blog link will give you all the information you should need for this exact scenario: http://msmvps.com/blogs/mweber/archive/2010/02/10/upgrading-an-active-directory-domain-from-windows-server-2003-to-windows-server-2008-or-windows-server-2008-r2.aspx
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jskfanAuthor Commented:
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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SandeshdubeySenior Server EngineerCommented:
Cross-platform upgrades (x86 to x64 or vice-versa) are not supported.You can install temp DC and then format/reload OS with Win2008 on old server and promote the server as DC.

Reference link:http://social.technet.microsoft.com/Forums/windowsserver/en-US/7cbcd550-3e8f-4570-9358-25740b7d9628/upgrade-from-active-directory-2003-sp2-to-active-directory-2008-r2

For adding new win2008 server in existin win2003 domain refer below link.

Adding first Windows Server 2008 R2 Domain Controller within Windows 2003 network
http://kpytko.wordpress.com/2011/08/25/adding-first-windows-server-2008-r2-domain-controller-within-windows-2003-network/
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JaihuntCommented:
1.First you Install the Windows 2008 64 bit OS in the new hardware.
2. Prepare the schema windows 2003 to 2008 ( insert the 2008 DVD in 2003 server run the adprep32.exe)
3. Dcpromo 2008 server.
4. Replication will be enabled automatically through KCC. Wait for replication to happen
5. If you are planning to remove the 2003 server from your environment. transfer FSMO roles to 2008 and move DNS dependency to 2008 server
6.Demote and perform MDC on the 2003 server.

Reference:

http://elmajdal.net/Win2k8/Migrating_Active_Directory_Domain_Controller_from_Windows_Server_2003_to_Windows_Server_2008.aspx

http://blogs.technet.com/b/askds/archive/2008/11/11/so-you-want-to-upgrade-to-windows-2008-domain-controllers-adprep.aspx
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jskfanAuthor Commented:
Thank you
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