Installing Exchange 2010 in multi Domain/Exchange Forest

I have a mutidomain domain forest w/ Exchange 2007 in the root forest domain (domain1) and Exchange 2003 in the 2nd domain (domain2).  All servers so far are Server 2003.  
Trying to install Exchange 2010 in domain2 on a newly added Server 2008 machine.  This will eventually be the new domain2 Exchange server, we are transitioning domain2 from Exchange 2003 to Exhcange 2010.
The problem is when installing Exchange 2010 it complains the following (see below).
I can't run setup.exe /preparead on any of the domain1 servers.  When ran from a 2003 x32 server on domain1 I get "setup.exe is valid, but for a machine type other than the current machine".  It's complaining that it is not x64.  OK so I move onto the Server 2003 x64 machine that Exchange 2007 is installed on which is also on domain1.  This time I get  "application failed to start because the file wer.dll was not found"   Is there another way to run setup /preparead on domain1 without Server 2008?
Thanks!

Error:
Setup needs to contact the Active Directory schema master but this computer is not in the same Active Directory domain as the schema master (DC=domain1,DC=local).
Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=2376fec1-b9ce-44db-beb6-cb9ac4788988

Error:
Setup encountered a problem while validating the state of Active Directory: Exchange organization-level objects have not been created, and setup cannot create them because the local computer is not in the same domain and site as the schema master.  Run setup with the /prepareAD parameter on a computer in the domain domain1 and site Default-First-Site-Name, and wait for replication to complete.
Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.1.218.11&e=ms.exch.err.Ex28883C&l=0&cl=cp
bfpnaeechangeAsked:
Who is Participating?
 
Simon Butler (Sembee)ConsultantCommented:
If you want to just drop a member server in to that domain/site, then do that. Run the commands then drop it out again. Remember that all of the doamins in the forest need to have prep run.

Simon.
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Simon Butler (Sembee)ConsultantCommented:
In this environment you are going to have to introduce a WIndows 2008/2008 R2 DC to run prep on. The root domain needs to have prep run on it before you can add Exchange 2010 in to any other domains.

Simon.
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bfpnaeechangeAuthor Commented:
I considered adding a 2008 server to domain1 however, I've read that a 2008 machine just has to be a member server not a DC to run the setup /adprep on.
Thought I'd post here before adding a 2008 server.
Thanks
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Simon Butler (Sembee)ConsultantCommented:
Where did you read that? Was it on a Microsoft site? It is wrong, you can run prep on a domain controller or a member server.

Simon.
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bfpnaeechangeAuthor Commented:
Your statement says " It is wrong, you can run prep on a domain controller or a member server."  Is that correct?  If so that's what I was saying above, that prep can be run on a member server.
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bfpnaeechangeAuthor Commented:
Actually I got it from the error message "Run setup with the /prepareAD parameter on a computer in the domain domain1 and site Default-First-Site-Name, and wait for replication to complete."
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Simon Butler (Sembee)ConsultantCommented:
"I've read that a 2008 machine just has to be a member server not a DC to run the setup /adprep on"

That was what I was saying was wrong. It can be EITHER a member server or a DC, it does not HAVE to be a member server.

All the error is saying is that the machine you want to run the command on needs to be a member of the domain, in that site. That doesn't mean it must be a member server, it can also be a domain controller.

Simon.
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bfpnaeechangeAuthor Commented:
OK I gotcha, I was looking for the lesser of the 2.  Would much rather build a member server than a DC just to run  the prep.  It was my understanding it could be either.
Thanks
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