Lower the functional level of your domain or forest on Windows Server

Not as common as it seems, more often necessary to downgrade your domain or forest, either because they are configured only for a very recent version of the Windows Server family, as shown in the example below (Windows Server 2012) and I need to perform demotion to Windows 2008 R2, in order to study.

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Remembering that it is not recommended to have Windows 2008 in your environment due to its end of support on January 14, 2020.

In this step, the domain level will be lowered to Windows Server 2008 R2, as shown in the figure below:

Set-ADDomainMode -Identity "yourdomain" -DomainMode "version you want"

In this other step, the forest level will be lowered to Windows Server 2008 R2, shown in the figure below:

Set-ADForestMode -Identity "yourdomain" -ForestMode "backwant" 

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After performing both domain and forest downgrades, new settings can be checked with the command Get-ADDomain and ForestMode, or through one's own Active Directory as shown below:

As a result it was possible to insert a domain controller with the version of Windows Server 2008 R2, this due to the lowering of the forest and domain level, observing the figure below:

reference: Mateus Henrique Tremonte Coimbra

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Felipe Santos
Felipe Santos is a Cloud and Security Architect, with experience in Windows Server, Cluster, Storages, Backups Veeam and Office 365 environments.



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