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Do you have both domains part of same forest ?yes<br />
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May be you are having parent child domain ? no<br />
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sorry . we are in the same domain and all the dcs &nbsp;are GC . two dcs on site and one in the hosted location and connecting via ADSL <br />
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What is the best AD site to be configure
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Do you have both domains part of same forest ?yes

May be you are having parent child domain ? no

sorry . we are in the same domain and all the dcs  are GC . two dcs on site and one in the hosted location and connecting via ADSL

What is the best AD site to be configure

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our corporate netwok running with two ADs . Our mail was hosted in one domian and the other &nbsp;one running our coporate user login &nbsp;. what is the best way to make single AD
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our corporate netwok running with two ADs . Our mail was hosted in one domian and the other  one running our coporate user login  . what is the best way to make single AD

Two ADs  - one for users and other one for Exchange

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

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.