AD functional level upgrade planning
Microsoft's edit ·
Microsoft's commit message in MicrosoftDocs/windowsserverdocs · commit eaab2fb · +4 −7 lines · also on GitHub
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title: Learn about upgrading your domain and forest functional levels in Active Directory Domain Services.
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author: robinharwood
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ms.author: roharwoo
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−ms.date: 07/15/2024
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+ms.date: 10/25/2024
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ms.topic: conceptual
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---
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# Identifying your functional level upgrade
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−>
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+>Applies to: Windows Server 2025 (preview), Windows Server 2022, Windows Server 2019, Windows Server 2016
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In this article learn about the process for upgrading your domain and forest functional levels in Active Directory Domain Services.
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- Check for any incompatible software or applications that might prevent you from upgrading to a newer version of Windows Server.
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−- Check for removed features to make sure that none are being used. To learn more about removed features, see [Features removed or no longer developed starting with Windows Server 2025 (preview)](../../../get-started/removed-deprecated-features-windows-server-2025.md).
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+- Check for removed features to make sure that none are being used. To learn more about removed features, see [Features removed or no longer developed starting with Windows Server 2025](../../../get-started/removed-deprecated-features-windows-server-2025.md).
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Documenting this information can help you identify the steps to take to ensure that you have a fully functional Windows Server environment.
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This article discusses the following upgrade options:
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−- Upgrade to a Windows Server 2025 (preview) forest
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+- Upgrade to a Windows Server 2025 forest
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- Upgrade to a Windows Server 2016 forest
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−> [!IMPORTANT]
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−> Windows Server 2025 is in PREVIEW. This information relates to a prerelease product that may be substantially modified before it's released. Microsoft makes no warranties, expressed or implied, with respect to the information provided here.
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## Upgrade functional levels to Windows Server 2025
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