Abnormal Security vs Microsoft Defender for Office 365
Email Security pricing comparison · 2026
Abnormal Security pricing ranges from $3–$8/user/month, while Microsoft Defender for Office 365 ranges from $2–$5/user/month. Microsoft Defender for Office 365 is typically 30% more affordable, though your actual cost depends on tier and team size.
Sources & confidence
Every dollar amount and contract clause below traces back to a sourced fact. We don't manufacture composite scores.
Plans at a glance
Every tier per product. Lock one to drive the cost row above and reveal a tier-specific outbound CTA.
What users say
Aggregated, with sample sizes. We use whichever review platform has data.
Abnormal Security and Microsoft Defender for Office 365 both operate in the email security category. This page compares their list pricing.
Plan-by-Plan Pricing
| Plan | Abnormal Security | Microsoft Defender for Office 365 |
|---|---|---|
| Inbound Email Security (Core) | $3 /month | $2 /month |
| Account Takeover Protection | Custom | $5 /month |
| AI Security Mailbox Automation | Custom | — |
| Email Productivity | Custom | — |
Cost at Scale
Total cost of ownership — licenses, implementation, and hidden costs included.
Abnormal Security
4 scenariosMicrosoft Defender for Office 365
3 scenariosMarket Intelligence
Abnormal Security
- Median annual cost
- $41,360
- Average negotiated discount
- 23%
- Based on
- 42 deals
Microsoft Defender for Office 365
- Median annual cost
- $250
- Based on
- 42 deals