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Your best bet is to use the Active Directory Migration Tool (ADMT) it will allow you to migrate users by OU's.<br />
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<a href="http://www.microsoft.com/downloads/details.aspx?familyid=6f86937b-533a-466d-a8e8-aff85ad3d212&displaylang=en" rel="ugc">http://www.microsoft.com/downloads/details.aspx?familyid=6f86937b-533a-466d-a8e8-aff85ad3d212&displaylang=en</a><br />
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Your best bet is to use the Active Directory Migration Tool (ADMT) it will allow you to migrate users by OU's.

http://www.microsoft.com/downloads/details.aspx?familyid=6f86937b-533a-466d-a8e8-aff85ad3d212&displaylang=en [http://www.microsoft.com/downloads/details.aspx?familyid=6f86937b-533a-466d-a8e8-aff85ad3d212&displaylang=en]



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Both Maco008 and Mahdvic suggestions are excellent. I tried P2V before, not ADMT. I am working as consultant, I like to use export and import rather than anything has to do directly on customer's server. With P2V, it may raise security concern and with ADMT I don't have experience on it, don't want to make mistake. Any suggestions on export and import? Thanks.
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Both Maco008 and Mahdvic suggestions are excellent. I tried P2V before, not ADMT. I am working as consultant, I like to use export and import rather than anything has to do directly on customer's server. With P2V, it may raise security concern and with ADMT I don't have experience on it, don't want to make mistake. Any suggestions on export and import? Thanks.

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P2V is the best simplest way to clone a system for testing. Thanks Maco008
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P2V is the best simplest way to clone a system for testing. Thanks Maco008

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We have OUs under OUs. Say, I have an OU named Texas, under Texas OUs, I have multiples OUs as Houston, Austin, Dallas.. How do I export them all out (Production Environment) and import to another DC (Test environment). I really mean to keep the same structures of OUs and users in specific OUs. Thanks in advance.
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We have OUs under OUs. Say, I have an OU named Texas, under Texas OUs, I have multiples OUs as Houston, Austin, Dallas.. How do I export them all out (Production Environment) and import to another DC (Test environment). I really mean to keep the same structures of OUs and users in specific OUs. Thanks in advance.

How do I export User's AD accounts in multiple OUs

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).