Exchange 2007 install fails

I have prepared our AD with the correct setup switches and all were successful. Now I have tried to install my 1st Exchange 2007 server in our existing Org and it fails with the following error:
"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 ADMSFZN and site ZO, and wait for replication to complete."

My problem is the following, I have already prepared the Forest with this command.

geoffhill27Asked:
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geoffhill27Connect With a Mentor Author Commented:
The problem was , I used the Exchange 2007 (without SP1) version to extend the schema etc. However the version I wanted to install was the Ex2k7 sp1, which needs additional schema extensions. So to make a long story short, I added a 64bit machine to our root domain and ran the AD updates again using the ex2k7sp1 version and aftewards I was able to install my foirst Exchange 2k7 sp1 server in the child domain.
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HousammuhannaCommented:
OK
if your server in the same subnet that the Schema exist then wait for force the replication
else
run PrepareAD from the Schema server with
setup.exe /prepareAD:ExchangeServerSubDomain.DomainOrParent.ext
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geoffhill27Author Commented:
@Housammuhanna,

thanks for your comment. Do I type in this exactly as written or do I replace the "ExchangeServerSubDomain.DomainOrParent.ext" with my domain name etc?
Also I was just wondering, do you have a source for this info that I could look up before I try it out on my domain?
tia
Geoff
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HousammuhannaCommented:
That depend
tell me how are you isntalling Exchange Server in that site
is it a child domain or additional domain with another site ?

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geoffhill27Author Commented:
I am installing exchange2k7  in a child domain of the root domain. The schemamaster is in the root domain.
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HousammuhannaCommented:
Yes for sure
then do these steps and should work for you as I have a smiler network

First after you install the new DC server in the child domain you MUST wait untill the replication complete, you can also check this using the Active Direcotory Site and services and see if the replication connector is created or not (Automarticlly generated)
Make sure that you can replicate with all serves
Next

lets say that your Root Domain named as :Root.local
and the Child domain is: baby.root.local
ADD THE CHILD DOMAIN ADMIN TO THE ENTERPRISE ADMIN and the RUN A FULL REPLICATION
in the schema Server run the Command
setup.exe /prepareAD:baby.root.local

then Forst the replication WITH ALL THE FORST

in the Child Domain run the command
Setup.exe /preparedomain

Also FORCE THE REPLICATION with all the forst

now you can start the installation normally
one of the MOST important thing to complete this is the REPLICATION and DNS
both should BE OK


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HousammuhannaCommented:
Would you please tell me, did you move the server from the Brunch to the HQ and run the Setup or what ?
I did not understnad
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geoffhill27Author Commented:
I moved another 64 bit server to our root domain and from that domain extended the schema etc. The issue is in our root domain was only 2 domain controllers because it is there just for schema protection and we dont use it for anyother reason. And none of the DC's in the root domain were 64bit, so I couldnt use the 64bit install files to extend the schema on the existing 32bit DC's.
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