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what is the difference between homemdb, SID guid , dn of user objects and mailbox user also difference between x400 and x500 email address
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what is the difference between homemdb, SID guid , dn of user objects and mailbox user also difference between x400 and x500 email address

EXCHANGE, ACTIVE DIRECTORY

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

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.