Schema Update for Win2003 to Win2008

We are looking to upgrade our AD to 2008, I have found a couple of guides which I intend to follow, the schema update before this can be done, does this need to be done on all domain controllers or can it be done on the primary domain controller and then it will replicate to the others?

So I would do:
adprep.exe /forestprep
adprep.exe /domainprep
adprep.exe /domainprep /gpprep

Is it worth at this point doing any exchange 2010 preps? as we will be looking to move to this also.

Cheers.
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Colchester_InstituteAsked:
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Lee W, MVPConnect With a Mentor Technology and Business Process AdvisorCommented:
As I just posted in another question:
Please reference this technet article on ADPREP
http://technet.microsoft.com/en-us/library/cc731728(WS.10).aspx

specifically, quoting the article:
ADPREP /FORESTPREP
You must run this command on the domain controller that holds the schema operations master role.

ADPREP /DOMAINPREP
You must run this command on the domain controller that holds the infrastructure operations master role for the domain.

Running ADPREP should not interfere or be noticeable to users. That said, whenever making a major change like this, you should make backups and if at all possible do it during one of the times you are least likely to affect users if something goes wrong.  
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R--RConnect With a Mentor Commented:
On a PDC where roles resides.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Further, there is no such thing as a PDC in active directory.
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Lee W, MVPConnect With a Mentor Technology and Business Process AdvisorCommented:
As for Exchange 2010 ADPREP, you can, but there's no real point to it until you add Exchange 2010.

Think of an ADPREP (for/by anything) as simply updating a database and its tables, adding necessary fields and the like so that new features can be utilized.  If you don't utilize them, all you've done is update the database so that you CAN use the new features later.
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