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How do I integrate Exchange across two domains in same forest?

I have domainA which already has exchange 2007 integrated into it. I have domainB which was added many years after domainA but is in the same forest. I have a two way trust setup between the two domains.

Do I simply run the Setup.com /PrepareDomain:domainB of target domain to be prepped? The issue is that Exchange 2007 does not see domainB at all. So I would basically have to have an account for email setup for end user in domainA and then have the user logon account in domainB.

Do I run this from exchange server in domainA or do I run this from one of the domain controllers in domainB?

Any help would be greatly appreciated as I'm familiar with exchange in a single domain environment, but never had a multi-domain environment.

Thanks
Jeremiah
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Will Szymkowski
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Hi Will,
Thank you for taking your valuable time to respond. DomainA would be our primary Exchange environment. A second exchange server in domainB would have been my second solution but not preferred. I think what you described is what we will have once /PrepareDomain is run on domainB. I like reduced complexity as we have a 3 person IT staff for our company. I will grant "Accept Multiple Solutions" points for this. Thank you again for your valuable time.

Thanks
Jeremiah
Good morning JJ,
Thank you for taking your valuable time as well to respond.  We have accounts setup in both domains to be domain admins for both domains. Since we have exchange installed and the setup.com needs to be run, we'll run the command from that server. Thank you and I have awarded points for your answer. This made my day as I'm inexperienced in multiple domain administration and I was mostly concerned in how this would work out without trashing either domain or the forest. Thanks again for your valuable time in responding.


Jeremiah
It turns out that I had an entire separate forest and the setup ad prep didn't do anything for exchange which confounded me. Needless to say, other forest is going away. Time to redesign the new Citrix environment back to simple basics. Good times :)