AD domain and forest functional levels
Microsoft's edit ·
Microsoft's commit message in MicrosoftDocs/windowsserverdocs · commit c8b204c · +2 −2 lines · also on GitHub
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Functional levels determine the available Active Directory Domain Services (AD DS) domain or forest capabilities. Functional levels also determine which Windows Server operating systems you can run on domain controllers in the domain or forest. Level changes happen when you use later versions of your domain controller operating system, the domain, or your forest functional level. This article describes how to raise Active Directory domain and forest functional levels. We recommend you upgrade Active Directory Domain Service servers to the latest release.
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−To activate the latest domain features, all domain controllers in the domain must run the version of Windows Server that matches or is newer than the desired functional level. If they don't meet this requirement, the administrator can't raise the domain functional level.
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+To enable the latest domain features, all domain controllers in the domain must run the version of Windows Server that matches or is newer than the desired functional level. If they don't meet this requirement, the administrator can't raise the domain functional level.
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−To activate the latest forest-wide features, all domain controllers in the forest must run the Windows Server operating system version that matches or is newer than the desired functional level. The current domain functional level must already be at the latest level. If the forest meets these requirements, the administrator can raise the forest functional level.
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+To enable the latest forest-wide features, all domain controllers in the forest must run the Windows Server operating system version that matches or is newer than the desired functional level. The current domain functional level must already be at the latest level. If the forest meets these requirements, the administrator can raise the forest functional level.
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The domain and forest functional levels only affect how the domain controllers operate together as a group. The clients that interact with the domain or with the forest are unaffected by the changes. Applications are also unaffected by these changes. However, applications can use new features found in later versions of Windows Server once the administrator raises the domain level. For more information about the functional levels, see [Active Directory Domain Services functional levels](/windows-server/identity/ad-ds/active-directory-functional-levels).
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