Exchange 2003 to 2K7 Transitionning in multi domain environment

I have an exchange 2003 organization with 4 front-ends (SMTP gateways, and OWA and RPC/Http) and one mailbox A/P cluster.
These Exchange servers are in a "resource" AD domain (A).
The hosted mailboxes are associated to Active directory accounts in 3 other AD domains (B,C and D).
Domains B and C are in the same AD site as the resource domain whereas domain D is in another AD site.
I am now thinking of the possibility to upgrade/transition to Exchange 2007.
The best way to transition this would have been to have 1 set of CAS/HUB/Mailbox roles deployed in each AD site.
I know Exchange 2007 is routing messages according to AD site link costs.
Nevertheless, would it be possible and supported to have all the Exchange 2007 servers in the same resource domain (A)?

Thanx for reading/helping.
shaomanAsked:
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MesthaCommented:
You have confused domains and sites.
There is no problem with having all of the servers in the same domain. They can also be in multiple AD sites.
However if all of the mailboxes are in one location, then I wouldn't split anything else, there is no point. Hub transport being located elsewhere is only required when you have a mailbox server in that location as well.

Simon.
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shaomanAuthor Commented:
Thanx for the info.
I was just not sure about that.
Have a good one.
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