Attic M365 FREE vs Microsoft Defender for Office 365: Side-by-Side Comparison (2026)

Attic M365 FREE: Protects Microsoft 365 users from phishing attacks using fake login pages. built by Attic Security. Core capabilities include Real-time detection of fake Microsoft 365 login pages, Red alarm screen warning when accessing fraudulent pages, Authenticity seal display on official Microsoft 365 login pages..

Microsoft Defender for Office 365: Email and collaboration security for Microsoft 365 environments. built by Microsoft. Core capabilities include AI-powered sentiment analysis for email filtering, Inline protection against malicious links and attachments in Outlook and Teams, Real-time detonation of attachments and links..

Both serve the Anti-Phishing market but differ in approach, feature depth, and target audience.

Attic M365 FREE differentiates with Real-time detection of fake Microsoft 365 login pages, Red alarm screen warning when accessing fraudulent pages, Authenticity seal display on official Microsoft 365 login pages. Microsoft Defender for Office 365 differentiates with AI-powered sentiment analysis for email filtering, Inline protection against malicious links and attachments in Outlook and Teams, Real-time detonation of attachments and links.

Attic M365 FREE is developed by Attic Security. Microsoft Defender for Office 365 is developed by Microsoft. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

Attic M365 FREE integrates with Microsoft 365. Microsoft Defender for Office 365 integrates with Microsoft Teams, SharePoint, OneDrive, Outlook, Microsoft 365. Check integration compatibility with your existing security stack before deciding.

Attic M365 FREE and Microsoft Defender for Office 365 serve similar Anti-Phishing use cases. Review the feature comparison above to determine which fits your requirements.