Single Exchange 2003 Server in Forest

I am about to introduce an Exchange 2003 server in to our Forest which is made up of mostly 2003 servers, a few 2000 left.  I have the top level domain of .local and several child domains.  I want the Exchange server to serve all.  Should I add the Exchange server to the top lever domain?  Should it be a domain controller?  Will I be able to create mailboxes for existing user accounts in the child domains?

Thanks in advance
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BrianIT ManagerCommented:
It really doesn't matter where you put it since it will be able to service all your accounts in all your domains.  Depending on the amount of users I would place it on a seperate server.  


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Seelan NaidooMicrosoft Systems AdminCommented:
just have the MX record for the exchange server in all your respective DNS zones ? make sure that SMTP traffice is allowed, and route between your subnets, LANs, WANs etc etc.
Exchange would be best placed on another server and shouldnt be on a Domain controller - In an ideal world. (It will work on one)
Make sure MX records are setup correcly as SeanUK77 suggests
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Windows Server 2003

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