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check this article:-<br />
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Bahloul.
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We have a W2K3 DC and the rest of the DCs are in W2k8. &nbsp;The older DC is there for a legacy apps. &nbsp;<br />
<br />
The functional level across our DCs are still in W2K3.<br />
<br />
we need to build a new W2012 domain and setup domain trust. &nbsp;Is this possible?<br />
<br />
Does any of you knows a good article the step-by-step to do list?<br />
<br />
Thanks.
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We have a W2K3 DC and the rest of the DCs are in W2k8.  The older DC is there for a legacy apps.  

The functional level across our DCs are still in W2K3.

we need to build a new W2012 domain and setup domain trust.  Is this possible?

Does any of you knows a good article the step-by-step to do list?

Thanks.

Setup Windows 2012 and Windows 2003 domain trust.

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

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).