Barracuda Email Security vs Microsoft Defender for Office 365

Barracuda Email Security and Microsoft Defender for Office 365 are both enterprise email gateway solutions. Barracuda Email Security email threat protection platform available as gateway appliance or cloud service, while Microsoft Defender for Office 365 microsoft's native email security for Microsoft 365 with XDR integration. The best choice depends on your organization's size, technical requirements, and budget.

Updated Feb 2026
How we compare:This comparison is based on official documentation, public pricing, community discussions, and aggregated user feedback, not hands-on testing by our team. We organize what real users and practitioners are saying across the web.

The Bottom Line

Choose Barracuda Email Security if significantly lower pricing than Proofpoint and Mimecast is your priority and small-to-mid-market organizations wanting effective email security at a lower price point than Proofpoint or Mimecast. Choose Microsoft Defender for Office 365 if deep native integration with Microsoft 365 and Defender XDR ecosystem matters most and microsoft 365-centric organizations wanting native email security with XDR integration and cost efficiency through E5 licensing.

Choose Barracuda Email Security if:

  • You value significantly lower pricing than Proofpoint and Mimecast
  • You value available as both appliance and cloud service for deployment flexibility
  • You value straightforward administration with less complexity
  • You want to avoid only protects Microsoft 365 — does not support Google Workspace or other platforms
  • You want to avoid detection efficacy for advanced threats historically behind Proofpoint and Mimecast

Choose Microsoft Defender for Office 365 if:

  • You value deep native integration with Microsoft 365 and Defender XDR ecosystem
  • You value included in Microsoft 365 E5 — significant cost savings for E5 customers
  • You value automated investigation and response reduces analyst workload
  • You want to avoid detection efficacy below Proofpoint for advanced targeted threats
  • You want to avoid cloud-native API protection less mature than gateway product

Feature Comparison

FeatureBarracuda Email SecurityMicrosoft Defender for Office 365
PricingFrom $3.60/user/month / appliance pricing variesPlan 1 from $2/user/month / Plan 2 from $5/user/month / included in E5
Pricing ModelPer-user subscription or appliance licensePer-user subscription (bundled with Microsoft 365 E5)
Open SourceNoNo
DeploymentCloud, Self-HostedCloud
Best ForSmall-to-mid-market organizations wanting effective email security at a lower price point than Proofpoint or MimecastMicrosoft 365-centric organizations wanting native email security with XDR integration and cost efficiency through E5 licensing
Multi-layer email threat scanningSupportedNot available
Anti-spam and anti-malware filteringSupportedNot available
Email encryption and DLPSupportedNot available

Sources

Related

Barracuda Email Security AlternativesMicrosoft Defender for Office 365 AlternativesBarracuda Email Security OverviewMicrosoft Defender for Office 365 Overview