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Email Security Software · Rank #3 of 10

Mimecast

Legacy SEG with mature archiving and awareness training bundle; PE-owned post-2022.

By Mimecast Limited (Permira) · Founded 2003 · London, UK / Lexington, MA · pe backed

Mimecast is the legacy email security and continuity platform founded in London in 2003. Permira took the company private in August 2022 at $5.8B. The product's historical strength is the integrated bundle of email security + email continuity + archiving + security awareness training, particularly attractive for buyers wanting a single vendor for those four functions. Acquired Code42 in 2024 for insider risk capability and Aware in 2024 for collaboration security. Trade-offs: similar to Proofpoint, PE ownership has driven aggressive pricing escalation, behavioral AI lags Abnormal, and Microsoft Defender for O365 is the constant replacement threat at every renewal.

Visit Mimecast Vendor pricing Compare to Proofpoint
Best for

Mid-market and enterprise buyers (500-50,000 employees) wanting an integrated bundle of email security + continuity + archive + awareness training under a single vendor, particularly in the UK and EU.

Worst for

Microsoft 365 E5 shops consolidating (Defender for O365 wins), modern AI-behavioral leadership buyers (Abnormal wins), or buyers wanting transparent pricing.

Vendor Trust Score

Is Mimecast a trustworthy vendor?

6.3/10
Mixed
Pricing transparency
Published rates; no hidden fees
4.5
Contract fairness
Reasonable terms; no auto-renew traps
6.0
Incident response
How they handle outages and breaches
7.5
Post-acquisition behavior
Customer treatment after M&A or PE
6.0
Executive stability
Leadership churn over 24 months
7.0
Roadmap honesty
Public commitments held
6.5
Trust signal log
  • 2022-05-10
    Permira announced $5.8B take-private of Mimecast
  • 2022-08-25
    Permira take-private completed; Mimecast delisted from Nasdaq
  • 2023-09-12
    First post-PE pricing increase wave reported (10-15% on renewing customers)
  • 2024-04-22
    Acquired Code42 for insider risk capability
    Filled visible insider-risk product gap
  • 2024-08-19
    Acquired Aware for collaboration channel security
  • 2025-03-15
    X1 unified platform announced; transition from legacy console begins
  • 2025-09-22
    Pricing increases reported 12-18% for 2025 renewing cohort
Vendor Trust is scored independently of product quality. A great product from an unfair vendor still earns a low trust score.
Review Intelligence

What 1,680 reviews actually say

Synthesized from G2, Capterra, Reddit, Trustpilot. Patterns >15% prevalence shown.

Last synthesized
2026-04-30

Praise patterns

  • Integrated bundle (security + continuity + archive + training) genuinely useful
    78% →
  • Email continuity differentiator during M365 outages
    64% →
  • Strong archiving and e-discovery
    51% →
  • Right call for UK and EU data residency
    47% →

Complaint patterns

  • PE-driven price escalation aggressive at renewal
    71% ↑
  • Behavioral AI lags Abnormal
    51% →
  • Platform UX dated and multi-console
    47% →
  • Microsoft Defender for O365 increasingly viable replacement
    38% ↑
  • Customer support quality declined post-take-private
    38% ↑
Sentiment trend (6 months)
72/100 -1 pts
12
01
02
03
04
05
Patterns are extracted from review corpus and human-verified. We surface trends, not anecdotes.
Verified Pricing

What buyers actually pay

247 anonymized deal disclosures · last updated 2026-04-30

Contribute your deal price
Company size Median annual
500-2,500 mailboxes $42,000
2,500-10,000 mailboxes $156,000
10,000+ mailboxes $540,000
Listed-price history
2022
Email Security Standard
$
+ $4.2/emp
2023
Email Security Standard
$
+ $4.75/emp
2024
Email Security Standard
$
+ $5.3/emp
2025
Email Security Standard
$
+ $6.1/emp
2026
Email Security Standard
$
+ $6.85/emp
Verified pricing is crowdsourced from buyers under anonymity guarantees. Vendor-listed prices are validated against actual deals quarterly.
Compliance & Security

Auto-verified certifications

Verified 2026-05-01
SOC 2 Type II
ISO 27001
HIPAA
GDPR
CCPA
PCI DSS
FedRAMP Authorized

Editorial: Strengths

  • Integrated bundle: email security + continuity + archive + awareness training
  • Mature email continuity (mail-flow during M365 outage), genuinely useful differentiator
  • Strong archiving and e-discovery
  • Code42 (insider risk) and Aware (collaboration) acquisitions extend platform
  • Broad European installed base; strong UK and EU data residency
  • Mature MSSP and SI partner ecosystem

Editorial: Weaknesses

  • PE-driven price escalation aggressive (10-18% annual increases reported under Permira)
  • Behavioral AI lags Abnormal materially
  • Platform UX dated; multi-console workflow
  • Microsoft Defender for O365 erodes installed base on every M365 E5 renewal
  • Customer support quality declined post-2022 take-private
  • Innovation pace slower than modern AI-behavioral challengers

Key features & integrations

  • +Pre-delivery secure email gateway
  • +Email continuity (mail-flow during M365/Workspace outage)
  • +Email archiving and e-discovery
  • +Targeted Threat Protection, URL and attachment sandbox
  • +DMARC analyzer and brand exploit protection
  • +Security awareness training (Ataata heritage)
  • +Code42 insider risk integration (post-2024 acquisition)
  • +Aware collaboration security (post-2024 acquisition)
200+ integrations
Microsoft 365Google WorkspaceMicrosoft SentinelSplunkCrowdStrike FalconOkta
Geography supported
Global; strongest in UK, EU, US, AU, ZA
Best fit
500–50,000+ employees · Mid-market and enterprise buyers wanting bundled email security + continuity + archive + training
Editorial deep-dive

Read our full ranking of Email Security Software

Mimecast ranks #3 in our editorial review of 10 email security software platforms. The deep-dive covers methodology, comparison tables, decision matrix, migration scoring, and FAQs.

Read the full ranking

Closest alternatives in Email Security Software

#2
Proofpoint
Largest legacy enterprise SEG installed base; Tessian acquisition added behavioral AI.
★ 4.4 opaque
#4
Microsoft Defender for Office 365
Bundled with M365 E5, the de facto default for Microsoft-anchored organizations.
★ 4.4 public
#1
Abnormal Security
AI-driven behavioral anomaly detection, modern category leader for BEC, ATO, and vendor email compromise.
★ 4.8 opaque
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