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<<TableOfContents()>>

= Migration ActiveDomain Controller Windows2003 32bit to Windows2008R2 =
* https://social.technet.microsoft.com/wiki/contents/articles/2903.active-directory-high-level-steps-to-upgrade.aspx

== 1. Schema upgrade  ==

The new object classes and attributes for the Windows Server 2003 R2 schema update are defined in a file named Sch31.ldf, which is located in the \cmpnents\R2\adprep folder on the Windows Server 2003 R2 Disc 2 (not in the \I386 folder of the Windows Server 2003 R2 Disc 1). You can view Windows Server 2003 R2 .ldf files in a text editor, but under no circumstances should their contents be modified. Modification of the .ldf files can cause irreversible changes and forest-wide failure. Use the Adprep command to make all schema updates. Do not use import tools such as LDIFDE to import the Windows Server 2003 R2 .ldf files.

* https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2003/cc755834%28v%3dws.10%29

== 2. Verify the schema version ==
{{{
dsquery * cn=schema,cn=configuration,dc=sivarajan,dc=com -scope base -attr objectVersion

The following table lists the Active Directory Schema and the corresponding Object Version:
Active Directory 	Object Version
Windows 2000 	        13
Windows 2003 	        30
Windows 2003 R2 	31
Windows 2008 	        44
Windows 2008 R2 	47
Windows 8 Beta 	        52
Windows 2012 	        56
Windows 2012 R2 	69
Windows 2016 	        87
Windows 2019 	        88

}}}

== 3. Add new server ==

Install new server with a correct version of OS and join this server to the existing domain..

== 4. Promote server to DC ==

Perform DCPRMO on this server and select Additional Domain Controller for an existing Domain option.

  Beginning with Windows Server 2012, you can install AD DS using Windows PowerShell the Install-ADDSDomainController command.
Reference

     http://technet.microsoft.com/en-us/library/cc753720(WS.10).aspx Jump
     http://technet.microsoft.com/en-us/library/hh472162#BKMK_PS Jump

 Note - If you are using Active Directory Integrated (ADI) DNS, it will get replicated as part of the Active Directory replication.

== 5. Transfer FSMO off decomissioned servers ==

If you are planning to decommission the old servers, you need to transfer FSMO roles, DHCP, etc to the new server.

Note - You can identify the FSMO role DC information using Netdom /Query FSMO command.
 References

*    FSMO - http://support.microsoft.com/kb/324801 Jump
*    DHCP - http://support.microsoft.com/kb/962355/en-us Jump

== 6. Remove old dc ==

You can remove (demote) a domain controller using DCPROMO command and again, since WS2012 also possible with PowerShell.
References

*    http://technet.microsoft.com/en-us/library/cc740017(WS.10).aspx Jump
*    http://technet.microsoft.com/en-us/library/hh472163#BKMK_RemovePS Jump