My organization setup is like the following.
FRDomain - Forest root domain
(I believe this is the root of the exchange forest)
ChildDomain1
Exchange 2003 (server)
(manages all Domain1 users
Has its own IP for SMTP and Client access)
ChildDomain2
Exchange 2010 SP2 (servers (CAS, HTS, DAGs))
Old Exchange 2003 (Server to be decommissioned )
(managed all Domain2 mailboxes
It had its own IP for SMTP and Client access)
Is there any reason to create additional servers in ChildDomain1 to manage the ChildDomain1 Mailboxes? if so which roles? How would this affect searches in the exchange management shell?