Wednesday , June 10 2020

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 “” –ForestMode Windows2008R2Forest

Set-ADDomainMode –Identity “” –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.

About Satheshwaran Manoharan

Satheshwaran Manoharan is an Microsoft Office Server and Services MVP , Publisher of Specialized in Office365 / Microsoft Exchange / Virtualization , Sathesh is an Messaging Expert supporting/Designing/Deploying many medium size businesses to large enterprises when it comes to Corporate messaging and Virtualization Infrastructure

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