KnowBe4 Cloud Email Security vs Microsoft Defender for Office 365: side-by-side comparison (2026)

KnowBe4 Cloud Email Security: AI-driven email security platform for Microsoft 365 inbound/outbound threats. Built by KnowBe4.

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

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

KnowBe4 Cloud Email Security is made by KnowBe4. Microsoft Defender for Office 365 is made by Microsoft. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

Often, yes. KnowBe4 Cloud Email Security and Microsoft Defender for Office 365 are both Email Security Platforms products, and both cover Microsoft 365. Use the table above to see where features, deployment and company size fit differ.