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Are domain A and Domain B in the same forest?
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Are domain A and Domain B in the same forest?

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No they are not in the same forest.
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Did not want to hear that. &nbsp;It explains why I could not find any info on it. &nbsp;Thanks for your help alimu.
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Did not want to hear that.  It explains why I could not find any info on it.  Thanks for your help alimu.

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sorry about the bad news...
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Both Domains are Windows 2003 Domains. &nbsp;Trusts are set up between the two domains. &nbsp;DNS is setup on both domains, and DNS Forwarding is also setup.<br />
I just loaded Exchange 2003 on Domain A and it is working fine. <br />
I would like to setup Domain B to use Domain A's exchange server (with everyone using the same email SMTP extension)<br />
I have loaded Exchange System Management Tools on Domain B's Domain Controller, and did run Forest Prep before install. &nbsp;So now users in domain B can have exchange tags, but does not do them any good. &nbsp;Not sure if I am heading down the right path, any help is appreciated.<br />

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Both Domains are Windows 2003 Domains.  Trusts are set up between the two domains.  DNS is setup on both domains, and DNS Forwarding is also setup.
I just loaded Exchange 2003 on Domain A and it is working fine. 
I would like to setup Domain B to use Domain A's exchange server (with everyone using the same email SMTP extension)
I have loaded Exchange System Management Tools on Domain B's Domain Controller, and did run Forest Prep before install.  So now users in domain B can have exchange tags, but does not do them any good.  Not sure if I am heading down the right path, any help is appreciated.


How to connect Domain A's Exchange 2003 Server So Domain B can use the server as exchange as well

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).