One 2K3 Exchange Server in a AD Domain with an AD Sub Domain

Hi,
I have Exchange 2003 Ent and Windows 2003 Ent Editions.  I have an AD domain with an AD sub domain.  The AD subdomain is used for another company in our building. They have their own DC.  We own the other company but because of political reasons we have different IT Admins.  Everything is working great.  Now we want to setup Exchange Mailboxes for those users in the AD Subdomain on our exchange server?  Can someone point me in the right direction?  Do I need to run some of the utilities on the Exchange 2003 Setup Disk on the Sub Domains DC and add their MX record to my DNS?  If not, how will they manage the Exchange Attributes for those users?  I have been running Exchange for several years but never with AD Subdomains.  I have searched everywhere for some pointers.  I hate to buy another copy of Exchange Ent to get around this.

Thanks
Jeremy
sqlguy29Asked:
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MazaraatCommented:
on the child domain (?) controller, run /forestprep /domainprep from the CD in cmd shell.  Make sue the account that is being used to run those is a member of the domain admin group.  This will allow you to mail enable the users in the child domain.
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sqlguy29Author Commented:
Great, Thats what I thought sounded logical.  Does this add the new mailboxes to the same store as the parent domain or is there additional configuration I need to do with Exchange?  I know how to setup the routing.
Thanks
Jeremy
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MazaraatCommented:
after you run the 'preps, you can mail enalbe each user and their mailbox will be located on the parent domains exchange server.  You could create a seperate store and have them go to it...but it wuold still be accessed and usually located on the exchange server.

Now the only problem with doing this is if you lose comms between the DCs or one of the DC's goes down they will not be able to access mailboxes.  So if you can, have a backup DC on both domains and make sure its also a GC holder.

Good Luck, glad to help!
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