Microsoft is bringing Microsoft Sentinel and Defender XDR closer together in the Microsoft Defender portal. For existing Sentinel environments, this is more than a new interface: Microsoft documents a clear deadline. After March 31, 2027, Microsoft Sentinel will no longer be supported in the Azure portal and will be available only in the Defender portal. For smaller IT teams, the date matters because permissions, navigation, connector behavior, and operational workflows should be reviewed before the cutover. If you use Sentinel today for alerts, hunting, or playbooks, the move should not be treated as a cosmetic portal change.
What Microsoft now states
Microsoft Learn describes Sentinel in the Defender portal as generally available. According to Microsoft, it can be used with Defender XDR or on its own; an E5 subscription is not required just to use Sentinel in the Defender portal. At the same time, Microsoft is moving the long-term operating experience to the Defender portal. After March 31, 2027, customers still using Sentinel in the Azure portal will be redirected to the Defender portal. The core statement is therefore explicit: the Azure portal is not the permanent operating location for Sentinel.
Why this matters for SMBs
Many organizations with 10 to 250 users do not run a dedicated SOC, but they still use selected Sentinel capabilities or have them operated by a partner. In those environments, security processes often depend on a small number of people: Who sees incidents? Which playbooks run automatically? Where are Defender and Sentinel alerts correlated? The Defender portal combines SIEM, SOAR, XDR, exposure management, cloud security, threat intelligence, and Security Copilot in one experience. That can reduce context switching, but it requires preparation so permissions and routines do not break on the deadline.
What changes operationally
- Sentinel and Defender incidents appear in a unified incident queue.
- Hunting and analysis move into the Defender navigation and use partly new entry points.
- Defender signals are correlated more strongly in the unified model.
- Some connector and alert-routing behavior changes after onboarding to the Defender portal.
Microsoft also explains that existing non-Microsoft connectors continue to operate, while alert ingestion for Microsoft security products is consolidated through the Defender XDR connector. In multi-workspace environments, this can help prevent tenant-wide alerts from being duplicated across workspaces. Those are exactly the details that should be tested before production analysts rely on the new portal.
Deadline and recommended sequence
The binding date is March 31, 2027. Microsoft recommends planning the transition now, reviewing prerequisites, and onboarding workspaces to the Defender portal in a controlled way. For small teams, an early pilot is safer than a late mass move. The wording matters: Microsoft gives this date as the end of Azure portal support for Sentinel, so the change should not be described as a vague future preference.
Concrete next steps
- Inventory all Sentinel workspaces, analytics rules, automation rules, playbooks, watchlists, and data connectors.
- Review roles and permissions for Sentinel and Microsoft Defender, especially when multiple tenants or service providers are involved.
- Test a noncritical workspace in the Defender portal and document the new paths for incidents, hunting, and connectors.
- Compare alert routing and incident creation before and after onboarding so duplicate alerts or visibility gaps are caught early.
- Treat the move as part of a Microsoft Security Assessment if Sentinel and Defender are already used together in production.
The deadline is in 2027, but the preparation touches production security processes. The risky areas are custom analytics rules, playbooks with Azure or third-party dependencies, multi-workspace operations, and permissions for external administrators. A screenshot comparison is not enough. The useful test is whether an analyst can handle the same incident end to end after the move: open the alert, inspect entities, start hunting, see playbook results, and document the decision.
Official Microsoft sources
- Microsoft Learn: Microsoft Sentinel in the Microsoft Defender portal
- Microsoft Learn: Transition your Microsoft Sentinel environment to the Defender portal
- Microsoft Learn: Unified security operations in the Microsoft Defender portal
If you already operate Sentinel, Defender XDR, and Microsoft 365 security features together, we can review the transition in a structured way: permissions, connectors, incident flow, and open risks. Talk to us before the portal move becomes a helpdesk problem.
What does this mean for your environment?
Assess the topic in the context of your Microsoft 365 environment and define a practical next step.
You speak directly with Sebastian Kerssen – working in the Microsoft ecosystem since 2014, with personal consulting and a dedicated point of contact.
