Exchange 2003 to 2010 transition

We are preparing to transition to Exchange 2010 from 2003 in a 2 domain forest. Our current setup in 2003 has 3 administrative groups, one of those being for the second domain.
As an example:

      ADMING1     Domain1
      ADMING2     Domain1
      ADMING3     Domain2

 As I understand with 2010, email routing uses AD Sites instead. We will have 2 CAS servers, one to route email for the folks in Domain1 and another for the folks in Domain2. Currently in AD, the folks in ADMING1 and ADMING3 are in the same AD Site.

Do I need to split ADMING3 folks off to their own site for routing to work correctly? or can they both be part of the same site.  

Who is Participating?
Peter HutchisonConnect With a Mentor Senior Network Systems SpecialistCommented:
Usually you would create a new site when you build a new DC server and that is placed in a different office or geographical location. The other site would have its own network subnets and possibly its own DHCP server.
 Also, you could install an Exchange CAS/HT server in the new site so that users can login to Exchange locally. If that is the case then there is a good reason to use a new site for those users.
schnazzerAuthor Commented:
I went ahead and put the child domain into it own site and moved the DCs over to it. Not sure why this wasn't set up to begin with but oh well. Thanks for the input.
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