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I have a multiple domain forest which is going to be migrated to a single domain in the near future.<br />
<br />
It is possible to have users with duplicate logons in seperate domains<br />
<br />
ie. <br />
Domain1\jsmith<br />
Domain2\jsmith<br />
<br />
What I want to do is identify any duplicate logons across the forrest in advance so I can plan for this when we migrate and decide which users will have to change their IDs.<br />
<br />
ANyone know a good way/script to check for this??
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I have a multiple domain forest which is going to be migrated to a single domain in the near future.

It is possible to have users with duplicate logons in seperate domains

ie. 
Domain1\jsmith
Domain2\jsmith

What I want to do is identify any duplicate logons across the forrest in advance so I can plan for this when we migrate and decide which users will have to change their IDs.

ANyone know a good way/script to check for this??

Identify duplicate logon IDs in AD Forest

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).