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Just over a year ago, we introduced the unified security operations (SecOps) experience within Microsoft Defender, bringing together the full stack of threat protection capabilities across” Security Incident Event Management (SIEM), Extended Detection and Response (XDR), Extended Security Posture Management (XSPM), Cloud Security, Threat Intelligence (TI), and Security Copilot. Thousands of organizations have already embraced this unified SecOps experience to streamline analyst workflows, enhance operational efficiency, and accelerate incident response across their security environments.  

Today, we are proud to share that the most advanced and integrated SIEM experience from Microsoft Sentinel is now fully available within the Microsoft Defender portal as one unified experience. This experience encompasses all SIEM features and is accessible to every customer, including large-scale enterprises and partners with complex security environments. With the general availability of multi-tenant and multi-workspace capabilities, security teams can now seamlessly collaborate, investigate threats, and manage incidents across multiple Microsoft Sentinel tenants—all from a single, unified queue. This advancement empowers analysts to operate more efficiently and effectively in today’s dynamic threat landscape. 

Why Customers Are Making the Move 

Thousands of organizations have already made the move—and they’re seeing real results.  

• Work smarter: Manage incidents, alerts, and investigations across tenants and workspaces in one unified view. 

• Detect faster: AI-driven insights reduce false positives by 85%* and boost alert correlation speed by 50%*. 

• Respond instantly: Security Copilot delivers guided investigations and automated summaries. 

• Hunt deeper: Investigate threats across Microsoft Sentinel and Defender XDR—no switching, no silos. 

“The Defender portal is a game-changer. Our team is faster, more focused, and finally working in one place.” 

— Security Operations Lead, Global Financial Services 

What’s New—and Why it Matters 

Advanced Hunting Enhancements
Unified queries across Microsoft Sentinel and Defender data, with Security Copilot-assisted KQL generation allows for threat hunting across all data sources from a single portal without context switching and delays. For more information, see Advanced hunting in the Microsoft Defender portal and Security Copilot in advanced hunting. 

Case Management 
Use native case workflows in Defender to manage complex investigations efficiently. Features include custom statuses, task assignments, due dates, and multi-incident linking, all while maintaining security context. For more information, see Manage cases natively in Microsoft Defender experience. 

SOC Optimization Tools
Get actionable, tailored recommendations to reduce costs, close data gaps, improve coverage, strengthen your security posture, and maximize ROI. To learn more about the different types of recommendations, see SOC optimization reference. 

Expanded Threat Intelligence
Import indicators in bulk, visualize data better, and map to MITRE ATT&CK. Enrich investigations with deeper context and better visibility into attacker behavior. For more information, see Threat detection features across the Microsoft unified security platform.

Embedded Security Copilot
The GenAI power of Security Copilot built to the experience. Utilize AI-powered tools to summarize incidents, analyze scripts/files, and generate incident reports directly within the portal. Accelerate response times and reduce analyst fatigue with intelligent automation. For more information, see Security Copilot in Defender. 

Seamless, Zero-Disruption Onboarding
Connecting your Microsoft Sentinel workspace to Defender is fast, simple, and non-disruptive. Your data stays intact, and you can continue using the classic Azure experience while unlocking the full power of Defender.

And going forward, all new features and innovations will be delivered exclusively through the Microsoft Defender portal—ensuring you always have access to the most advanced tools in the Microsoft Security ecosystem. 

Take Action Now

Transform your SecOps with Microsoft Defender and take advantage of the latest innovations.  

• Get started today: https://security.microsoft.com 
  
  


• Begin the process of onboarding your Microsoft Sentinel workspaces to the Defender portal
   


• Transition Guide 

• Pre-recorded webinar  ​ 

• Register for upcoming webinars here. ​ 

​ *Source: Microsoft internal research