Microsoft Entra ID
GeneralConnect Version History
In brief
The documented deadline changed to April 7, 2027. Synchronization services require version 2.5.79.0 or later and application-based authentication after legacy authentication ends.
What Entra admins need to know
Upgrade Entra Connect Sync and configure application-based authentication by the deadline, or synchronization will stop. These steps are required to restore service if it stops.
This editorial summary was generated by AI from the documentation changes. Verify important details in the full Microsoft Learn article.
Documentation change
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This article helps you keep track of the versions that have released and the changes in those versions.
Known issue: Synchronization fails after upgrade if miiserver.exe.config was previously modified
Applies to
@@ -18,9 +18,9 @@ The Microsoft Entra team regularly updates Microsoft Entra Connect with new feat This article helps you keep track of the versions that have released and the changes in those versions. >[!IMPORTANT]->**Mandatory Upgrade Required**: All synchronization services in Microsoft Entra Connect Sync will stop working on **September 30, 2026** if you're not on at least version 2.5.79.0. In May 2025, we released this version with a back-end service change that hardens our services. Upgrade before this deadline to avoid any service disruption.+>Mandatory upgrade required: Upgrade Microsoft Entra Connect Sync to version 2.5.79.0 or later and configure application-based authentication by April 7, 2027. Legacy authentication is being retired, and synchronization services will stop working after this date if these requirements aren't met. >->If you're unable to upgrade before the deadline, all synchronization services will fail until you upgrade to the latest version. The Microsoft Entra Connect Sync .msi installation file is exclusively available on [Microsoft Entra Admin Center](https://entra.microsoft.com/#view/Microsoft_AAD_Connect_Provisioning/AADConnectMenuBlade/%7E/GetStarted). Make sure you meet the minimum requirements including .NET Framework 4.7.2 and TLS 1.2.+>If synchronization stops, upgrade to the latest version and configure application-based authentication to restore service. The Microsoft Entra Connect Sync .msi installation file is exclusively available on [Microsoft Entra Admin Center](https://entra.microsoft.com/#view/Microsoft_AAD_Connect_Provisioning/AADConnectMenuBlade/%7E/GetStarted). Make sure you meet the minimum requirements including .NET Framework 4.7.2 and TLS 1.2. ## Known issue: Synchronization fails after upgrade if miiserver.exe.config was previously modified Applies to