Microsoft Defender for Office 365 vs Sublime Email Security: side-by-side comparison (2026)

Microsoft Defender for Office 365: Email and collaboration security for Microsoft 365 environments. Built by Microsoft.

Sublime Email Security: AI-powered email security platform with agentic automation and detection. Built by Sublime Security.

The table above shows where their features, integrations, deployment and company size fit differ.

Microsoft Defender for Office 365 is made by Microsoft. Sublime Email Security is made by Sublime Security. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

Often, yes. Microsoft Defender for Office 365 and Sublime Email Security are both Email Security Platforms products. Use the table above to see where features, deployment and company size fit differ.