Step by Step guide to lower Active Directory Functional Level

Step by Step guide to lower Active Directory Functional Level

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Newest member in the A-Team, Aman Sahota, gives us insights on some simple, yet important steps in Active Directory management.

In Windows Server 2008 R2 and Windows Server 2012, you can lower the Forest and Domain functional level from 2012 to 2008 R2, or from 2008 R2 to 2008. But you cannot lower it beyond 2008. Also, this is not possible by GUI, you have to use PowerShell for doing this. Let’s see how you can do it in the following steps:

 

1. Import the AD module

Import-Module -Name ActiveDirectory

 

2. Check the Forest Functional level of your Active Directory

Get-ADForest | Format-Table Name , ForestMode

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You can also check it by going to AD Domain and services.

 

3. Lower the Forest Functional Level and then the Domain Functional Level

Set-ADForestMode –Identity “woodgrovebank.com” –ForestMode Windows2008Forest

Set-ADDomainMode –Identity “woodgrovebank.com” –DomainMode Windows2008Domain

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4. To Confirm your Forest Functional level of your Active Directory

Get-ADForest | Format-Table Name , ForestMode

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Hope this helps. Happy reading!

-A-Team!

 

 

Comments
  • If you have an exchange 2013 server in a domain and forest as 2012 level, then lower it to 2008R2 level will that do anything to exchange?

  • This has worked wonderfully.

    Next time I won't set to 2012 unless I am sure I won't need 2008!

    Thanks Heaps!

  • I followed the great instructions several times and the forest and domain functional levels are still at 2012.  Do you have a clue as to what steps to take next?

  • Man, you are the best ! I don't know why Microsoft doesn't have people like you.. I took me the whole day reading different websites till i found this post. thanks very much.

  • yeah "man"
    you'r the cool, i was kind of wander to get this stuff , finally i got it and i tried it and get the things up and running
    thanx man

  • thanks, its working perfectly ...

  • Thanks!

  • Worked perfectly from 2012R2 to 2008R2. Thanks!

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