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Tuesday, April 23, 2024

The Functional Level of the forest is incompatible with this operating system

I want to introduce a Windows 2008 r2 domain controller in a Windows 2012/Windows 2012R2 Domain .

let see how to we can lower Active Directory domain/forest Functional Level from 2012/2012R2 to 2008 R2


To See Existing Forest/Domain functional level

Open Power shell in Windows Server 2012 Domain Controller

Import-Module ActiveDirectory






Authentication Policies is the only important feature enabled on 2012 R2.

To Reduce the forest/domain functional level to 2008R2

Set-ADForestMode –Identity “testcareexchange.biz” –ForestMode Windows2008R2Forest

Set-ADDomainMode –Identity “testcareexchange.biz” –DomainMode Windows2008R2Domain




Now my 2008R2 domain controller can be introduced .


Note – Once Recycle Bin is enabled on 2012/2012R2 Level it won’t allow you to roll back.

Satheshwaran Manoharan
Satheshwaran Manoharanhttps://www.azure365pro.com
Award-winning Technology Leader with a wealth of experience running large teams and diversified industry exposure in cloud computing. From shipping lines to rolling stocks.In-depth expertise in driving cloud adoption strategies and modernizing systems to cloud native. Specialized in Microsoft Cloud, DevOps, and Microsoft 365 Stack and conducted numerous successful projects worldwide. Also, Acting as a Technical Advisor for various start-ups.

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