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

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

Sublime Security Sublime Rules: Open-source detection rules for email attacks like BEC, phishing, and malware, 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 Security Sublime Rules is open-source. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

In part. Microsoft Defender for Office 365 and Sublime Security Sublime Rules are not in the same category on CybersecTools. Key differences: Microsoft Defender for Office 365 is Commercial while Sublime Security Sublime Rules is Free. Use the table above to see where features, deployment and company size fit differ.