Abnormal Security vs Microsoft Defender for Office 365
Email Security pricing comparison · 2026
Abnormal Security is quote-based, while Microsoft Defender for Office 365 costs $2–$5/user/mo. These products use different pricing models ( vs Per-seat subscription), so a direct price comparison isn't meaningful — costs depend on usage volume and mix.
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.
Contract terms
The fine print, surfaced. Green = buyer-friendly. Each clause backed by a quoted source.
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 | Custom | $2 /user/month |
| Account Takeover Protection | Custom | $5 /user/month |
| AI Security Mailbox Automation | Custom | — |
| Email Productivity | Custom | — |
Market 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
Contract Terms
| Term | Abnormal Security | Microsoft Defender for Office 365 |
|---|---|---|
| Auto-renewal | — | — |
| Cancellation | — | seven days after the start or renewal |
| Minimum commitment | 1 year | — |
| Price escalation | 5% annual uplift is standard on renewals, though this can be reduced or removed with multi-year agreements or growth commitments | — |