MC1268924 — Microsoft Defender XDR: Email summary powered by Security Copilot on the email entity page

Microsoft Defender XDR will add an AI-powered Email summary via Security Copilot on the Email entity page, launching in public preview mid-April 2026 and generally available by mid-May 2026. It provides concise threat insights, timeline analysis, URL and attachment assessments, requiring Security Copilot access and SCUs.