Bitdefender GravityZone Security for Exchange vs Microsoft Defender for Office 365: side-by-side comparison (2026)

Bitdefender GravityZone Security for Exchange: Email security for Microsoft Exchange servers with antispam and antimalware. Built by Bitdefender.

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.

Bitdefender GravityZone Security for Exchange is made by Bitdefender. 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. Bitdefender GravityZone Security for Exchange 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.