With older versions of Windows Server it was not possible to downgrade the domain and forest functional level once upgraded. However this has changed since Windows Server 2012R2, using PowerShell you can now downgrade the Domain and Forest functional level.
To do so follow these steps:
1. Log on to the domain controller as domain administrator / Enterprise administrator.
2. Run PowerShell as Administrator.
3. In PowerShell enter this command to import the AD Module
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Import-Module –Name ActiveDirectory |
4. Now lets first confirm the current forest and domain functional levels by typing the following in PowerShell:
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(Get-ADForest).ForestMode (Get-ADDomain).DomainMode |
5. Next to set the forest functional level to Windows 2008R2 in powershell type:
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$Forest = Get-ADForest Set-ADForestMode -Identity $Forest -Server $Forest.SchemaMaster -ForestMode Windows2008R2Forest |
6. Enter Y to confirm the change.
7. Next to set the domain functional level to Windows 2008 R2, in PowerShell Type:
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$PDC = (Get-ADDomain).pdcemulator Set-ADDomainMode -Identity xanderbikbergen.com -DomainMode Windows2008R2Domain -Server $PDC |
8. Confirm that the forest and domain functional level have succesfully been downgraded, in PowerShell type:
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(Get-ADForest).ForestMode (Get-ADDomain).DomainMode |
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