Entra Connect prerequisites
Microsoft's edit ·
Microsoft's commit message in MicrosoftDocs/entra-docs · commit bb270a4 · +4 −7 lines · also on GitHub
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ms.tgt_pltfrm: na
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ms.custom: no-azure-ad-ps-ref, sfi-ga-nochange
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ms.topic: how-to
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−ms.date: 09/29/2025
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+ms.date: 01/16/2026
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ms.subservice: hybrid-connect
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ms.author: jomondi
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---
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#### Installation prerequisites
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−- Microsoft Entra Connect must be installed on a domain-joined server that runs Windows Server 2022, Windows Server 2019, or Windows Server 2016. We recommend Windows Server 2022. You can deploy Microsoft Entra Connect on Windows Server 2016. However, since Windows Server 2016 is in extended support, you might need [a paid support program](/lifecycle/policies/fixed#extended-support) if you require support for this configuration. Installing on unsupported versions of Windows Server may cause service failures or unexpected behavior.
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+Microsoft Entra Connect must be installed on a domain-joined server that runs Windows Server 2025 or Windows Server 2022. You can deploy Microsoft Entra Connect on older Windows Server versions in extended support; however, support for this configuration may require [a paid support program](~/lifecycle/policies/fixed#extended-support). Installing unsupported versions of Windows Server may cause service failures or unexpected behavior.
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− > [!IMPORTANT]
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− > **Windows Server 2025 is NOT supported.**
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− > There is a known issue on Windows Server 2025 that can cause Microsoft Entra Connect Sync to encounter synchronization problems. If you upgraded to Windows Server 2025, make sure you have installed [October 20, 2025 - KB5070773](https://support.microsoft.com/topic/october-20-2025-kb5070773-os-build-26100-6901-out-of-band-f8effaa1-1c73-41e5-bcb3-e58a46c7601e) update, or later. After installing this update, restart the server for the changes to take effect.
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− > Windows Server 2025 support for Microsoft Entra Connect Sync is planned for a future release.
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+> [!IMPORTANT]
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+> There is a known issue on Windows Server 2025 that can cause Microsoft Entra Connect Sync to encounter synchronization problems. If you upgraded to Windows Server 2025, make sure you have installed [October 20, 2025 - KB5070773](https://support.microsoft.com/topic/october-20-2025-kb5070773-os-build-26100-6901-out-of-band-f8effaa1-1c73-41e5-bcb3-e58a46c7601e) update, or later. After installing this update, restart the server for the changes to take effect.
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