AD domain and forest functional levels
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# Raise domain and forest functional levels in Active Directory Domain Services
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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 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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