Microsoft Defender for Office 365 vs Mimecast -- Cloud Email Security Compared
Microsoft Defender for Office 365 vs Mimecast
Microsoft Defender for Office 365 and Mimecast are both cloud email security solutions. Microsoft Defender for Office 365 microsoft's native email security for Microsoft 365 with XDR integration, while Mimecast cloud email security platform with threat protection, archiving, and continuity. The best choice depends on your organization's size, technical requirements, and budget.
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The Verdict
Choose Microsoft Defender for Office 365 if deep native integration with Microsoft 365 and Defender XDR ecosystem is your priority and microsoft 365-centric organizations wanting native email security with XDR integration and cost efficiency through E5 licensing. Choose Mimecast if email continuity keeps mail flowing during outages — unique differentiator matters most and mid-to-large enterprises wanting a unified email security, archiving, and continuity platform with strong API integrations.
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Feature-by-Feature Comparison
| Feature | Mimecast | Microsoft Defender for Office 365 |
|---|---|---|
| Pricing | Custom pricing / per-user licensing | Plan 1 from $2/user/month / Plan 2 from $5/user/month / included in E5 |
| Pricing Model | Per-user subscription | Per-user subscription (bundled with Microsoft 365 E5) |
| Open Source | No | No |
| Deployment | Cloud | Cloud |
| Best For | Mid-to-large enterprises wanting a unified email security, archiving, and continuity platform with strong API integrations | Microsoft 365-centric organizations wanting native email security with XDR integration and cost efficiency through E5 licensing |
| Safe Links (URL detonation and rewrit... | Not available | Supported |
| Safe Attachments (sandbox analysis) | Not available | Supported |
| Anti-phishing with impersonation prot... | Not available | Supported |
When to Choose Each Tool
Choose Mimecast when:
- +You value email continuity keeps mail flowing during outages — unique differentiator
- +You value strong impersonation and brand protection capabilities
- +You value unified platform covering security, archiving, and continuity
- +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 when:
- +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 slightly behind Proofpoint for advanced threats
- +You want to avoid email archiving search performance can be slow on large datasets
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Pros & Cons Comparison
Mimecast
Pros
- +Email continuity keeps mail flowing during outages — unique differentiator
- +Strong impersonation and brand protection capabilities
- +Unified platform covering security, archiving, and continuity
- +Good API ecosystem for SIEM and SOAR integrations
- +Easier administration compared to Proofpoint for mid-market teams
Cons
- –Detection efficacy slightly behind Proofpoint for advanced threats
- –Email archiving search performance can be slow on large datasets
- –Pricing is still premium and comparable to Proofpoint
- –URL rewriting can break some legitimate links
- –Security awareness training less mature than dedicated platforms
Microsoft Defender for Office 365
Pros
- +Deep native integration with Microsoft 365 and Defender XDR ecosystem
- +Included in Microsoft 365 E5 — significant cost savings for E5 customers
- +Automated investigation and response reduces analyst workload
- +Cross-domain detection correlates email threats with identity and endpoint signals
- +Continuous improvement from Microsoft's massive threat intelligence network
Cons
- –Only protects Microsoft 365 — does not support Google Workspace or other platforms
- –Detection efficacy for advanced threats historically behind Proofpoint and Mimecast
- –Configuration complexity across multiple Microsoft security portals
- –Plan 1 lacks important features like AIR and Threat Explorer
- –Less effective at catching novel social engineering attacks
Sources & References
- Microsoft Defender for Office 365 — Official Website & Documentation[Vendor]
- Mimecast — Official Website & Documentation[Vendor]
- Microsoft Defender for Office 365 Reviews on G2[User Reviews]
- Mimecast Reviews on G2[User Reviews]
- Microsoft Defender for Office 365 Reviews on TrustRadius[User Reviews]
- Mimecast Reviews on TrustRadius[User Reviews]
- Microsoft Defender for Office 365 Reviews on PeerSpot[User Reviews]
- Mimecast Reviews on PeerSpot[User Reviews]
- Gartner Market Guide for CNAPP 2024[Analyst Report]
- Forrester Wave: Cloud Workload Security 2024[Analyst Report]
- IDC MarketScape: CNAPP 2024[Analyst Report]
- Cloud Security Alliance: Cloud Controls Matrix[Industry Framework]
- Gartner Peer Insights: CNAPP[Peer Reviews]
Microsoft Defender for Office 365 vs Mimecast FAQ
Common questions about choosing between Microsoft Defender for Office 365 and Mimecast.
What is the main difference between Microsoft Defender for Office 365 and Mimecast?
Microsoft Defender for Office 365 and Mimecast are both cloud email security solutions. Microsoft Defender for Office 365 microsoft's native email security for Microsoft 365 with XDR integration, while Mimecast cloud email security platform with threat protection, archiving, and continuity. The best choice depends on your organization's size, technical requirements, and budget.
Is Mimecast better than Microsoft Defender for Office 365?
Choose Microsoft Defender for Office 365 if deep native integration with Microsoft 365 and Defender XDR ecosystem is your priority and microsoft 365-centric organizations wanting native email security with XDR integration and cost efficiency through E5 licensing. Choose Mimecast if email continuity keeps mail flowing during outages — unique differentiator matters most and mid-to-large enterprises wanting a unified email security, archiving, and continuity platform with strong API integrations.
How much does Mimecast cost compared to Microsoft Defender for Office 365?
Mimecast pricing: Custom pricing / per-user licensing. Microsoft Defender for Office 365 pricing: Plan 1 from $2/user/month / Plan 2 from $5/user/month / included in E5. Mimecast's pricing model is per-user subscription, while Microsoft Defender for Office 365 uses per-user subscription (bundled with microsoft 365 e5) pricing.
Can I migrate from Microsoft Defender for Office 365 to Mimecast?
Yes, you can migrate from Microsoft Defender for Office 365 to Mimecast. The migration process depends on your specific setup and the features you use. Both platforms offer APIs that can facilitate automated migration. Consider running both tools in parallel during the transition to ensure zero downtime.
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