Security Licensing Unbundled:
Why Microsoft’s Security Suite Costs More Than Best-of-Breed
Microsoft positions its integrated security stack as a cost-saving consolidation play. But the licensing requirements — E5 Security, E5 Compliance, Defender for Endpoint P2, Sentinel — often exceed the cost of equivalent best-of-breed solutions. This paper provides a head-to-head cost analysis, identifies where Microsoft security excels versus where it falls short, and delivers a negotiation strategy to unbundle what you need.
Executive Summary
Microsoft has positioned itself as an enterprise security platform, not just a productivity vendor. The narrative is compelling: consolidate your security stack onto Microsoft, eliminate point solutions, reduce integration complexity, and save money. The reality, when measured against actual licensing costs and capability requirements, tells a different story.
Key Findings
The Consolidation Myth: Why “One Vendor” Doesn’t Mean “Lower Cost”
Microsoft’s security consolidation pitch rests on three claims: fewer vendors means lower cost, integrated tools work better together, and Microsoft’s scale makes them the most cost-effective option. Each claim requires scrutiny.
Claim 1: Fewer Vendors = Lower Cost. Microsoft argues that replacing 5–8 point security solutions with Microsoft’s integrated stack eliminates duplicate licensing. The maths works only if the organisation is paying full list price for every incumbent vendor and will deploy every Microsoft security capability at enterprise scale. In practice, incumbent vendor contracts are negotiated (often at 40–60% below list), Microsoft security features are deployed selectively (the E5 shelfware problem), and Microsoft’s stack has coverage gaps that require supplementary tools regardless. The net calculation often favours the optimised multi-vendor approach.
Claim 2: Integration = Better Security. Microsoft’s security tools share a common data fabric (Microsoft Graph Security API), unified management portal (Microsoft 365 Defender), and native telemetry from M365 services. This integration is a genuine advantage for threats that originate within the Microsoft ecosystem — email phishing, identity compromise, cloud app misuse. However, enterprise environments span multiple clouds, on-premises infrastructure, non-Microsoft applications, and third-party SaaS platforms. Microsoft’s security integration advantage diminishes proportionally as the environment extends beyond the Microsoft ecosystem.
Claim 3: Microsoft’s Scale = Lowest Cost. Microsoft’s security pricing is per-user, per-month, scaled to the entire organisation. Best-of-breed vendors typically price per endpoint, per asset, or per GB — metrics that scale with actual security footprint, not total headcount. For an organisation with 10,000 employees where 3,000 require advanced endpoint protection and 500 generate SIEM-relevant telemetry, Microsoft’s per-user-per-organisation pricing model is structurally more expensive than targeted best-of-breed licensing.
In 65% of security licensing assessments conducted by Redress, the total cost of Microsoft’s full security stack (E5 Security + E5 Compliance + Sentinel + Defender for Cloud) exceeded the total cost of the organisation’s existing multi-vendor security architecture. The “consolidation savings” Microsoft projected existed only in Microsoft’s TCO model — not in the customer’s actual cost comparison.
Microsoft Security Licensing: The Component Anatomy
Microsoft’s security licensing is distributed across multiple SKUs, add-ons, and consumption-based services. Understanding the full licensing landscape is essential for any cost analysis.
| Microsoft Security Component | How to Licence | Per-User/Mo Cost | What It Covers |
|---|---|---|---|
| E3 Security Baseline | Included in M365 E3 | $0 (part of E3) | Entra ID P1, Intune, AIP P1, Conditional Access, MFA, Basic DLP, Windows E3 |
| Microsoft 365 E5 Security | Add-on to E3 or included in E5 | $12/user/mo | Defender for Endpoint P2, Defender for Office 365 P2, Defender for Identity, Defender for Cloud Apps, Entra ID P2 |
| Microsoft 365 E5 Compliance | Add-on to E3 or included in E5 | $12/user/mo | Advanced eDiscovery, Insider Risk Mgmt, Communication Compliance, Advanced Audit, Customer Lockbox, Information Barriers |
| Microsoft Sentinel | Azure consumption (per GB/day) | $8–$18/user/mo avg | Cloud-native SIEM, security analytics, SOAR, threat hunting |
| Defender for Cloud | Azure consumption (per server) | $15/server/mo+ | Cloud workload protection (CWPP), CSPM, container security |
| Entra ID Governance | Standalone add-on | $7/user/mo | Lifecycle workflows, access reviews, entitlement management |
| Microsoft Copilot for Security | Consumption (per SCU/hr) | Variable ($4/SCU/hr) | AI-powered security analysis, incident response, threat intelligence |
The Cumulative Cost. An organisation deploying Microsoft’s full security stack on top of M365 E3 faces cumulative security licensing of: E5 Security ($12) + E5 Compliance ($12) + Sentinel (~$12 average) + Defender for Cloud (variable) + Entra ID Governance ($7) = approximately $43+ per user per month in security licensing alone. Added to E3 ($36/user/mo), the total per-user cost reaches $79+/user/month — exceeding E5 ($57/user/mo) because Sentinel, Defender for Cloud, and Entra ID Governance are not included even in E5.
Many organisations upgrade to E5 ($57/user/mo) believing it provides comprehensive security. E5 includes E5 Security and E5 Compliance features — but it does not include Microsoft Sentinel, Defender for Cloud, Entra ID Governance, or Copilot for Security. Organisations that upgrade to E5 for “security” and then discover they still need to purchase Sentinel and Defender for Cloud have already paid the E5 premium and now face additional consumption-based security costs on top.
Head-to-Head Cost Analysis: Microsoft vs. Best-of-Breed
A domain-by-domain cost comparison for a 5,000-user enterprise with standard security requirements. All pricing reflects negotiated enterprise rates, not list pricing.
| Security Domain | Microsoft Solution & Cost | Best-of-Breed Alternative & Cost | Winner |
|---|---|---|---|
| Endpoint Detection & Response | Defender for Endpoint P2 $5.20/user/mo (add-on) or included in E5 Security | CrowdStrike Falcon Go/Pro $3.50–$8/endpoint/mo (negotiated) | Depends on scope |
| Email Security | Defender for Office 365 P2 $5/user/mo (add-on) or included in E5 Security | Proofpoint / Mimecast $3–$6/user/mo (negotiated) | Microsoft (native integration) |
| Identity Protection | Entra ID P2 $9/user/mo (add-on) or included in E5 Security | Okta + CyberArk/SailPoint $6–$12/user/mo combined | Microsoft (native to M365) |
| Cloud App Security (CASB) | Defender for Cloud Apps $3.50/user/mo (add-on) or included in E5 Security | Netskope / Zscaler $4–$8/user/mo | Microsoft (cost) |
| SIEM | Microsoft Sentinel $2.46/GB/day (PAYG) — avg $8–$18/user/mo | Splunk Cloud / Elastic / Chronicle $5–$15/user/mo (negotiated) | Best-of-breed (cost + flexibility) |
| Compliance & eDiscovery | E5 Compliance $12/user/mo (add-on) | Relativity + Proofpoint Archive $4–$8/user/mo (for required users only) | Best-of-breed (targeted licensing) |
| Vulnerability Management | Defender Vulnerability Mgmt $2/endpoint/mo add-on | Tenable / Qualys / Rapid7 $1.50–$4/asset/mo | Best-of-breed (depth) |
| Network Security | Limited (Azure Firewall, NSGs) | Palo Alto / Fortinet / Zscaler $3–$8/user/mo | Best-of-breed (not Microsoft’s domain) |
Total Security Stack Cost Comparison — 5,000-User Enterprise
per user per month
per user per month
security architecture
Microsoft stack costs more
Where Microsoft Security Excels
Microsoft’s security stack has genuine strengths that best-of-breed alternatives cannot replicate. Understanding these strengths is essential for any objective assessment.
Identity & Access Management
Entra ID P2 (Privileged Identity Management, Identity Protection, Access Reviews) is natively integrated with every M365 service, Azure resource, and Entra ID-joined application. No third-party IAM solution can match this depth of integration within the Microsoft ecosystem. For organisations with M365 as the primary productivity platform, Entra ID P2 is the objectively best identity protection choice.
Email Security
Defender for Office 365 P2 operates inline within the Exchange Online mail flow, providing zero-day phishing protection, safe attachments, and automated investigation with native telemetry from M365. Third-party email security tools (Proofpoint, Mimecast) require MX record routing or API integration, adding latency and complexity. For M365-hosted email, Defender for Office 365 is the most effective and operationally simplest option.
Cloud App Security (M365 Scope)
Defender for Cloud Apps provides deep visibility into M365 SaaS usage, Shadow IT discovery, and DLP policy enforcement across Microsoft cloud applications. Within the M365 ecosystem, its coverage exceeds standalone CASB solutions. The advantage diminishes when the organisation uses significant non-Microsoft SaaS (Salesforce, ServiceNow, Slack), where Netskope and Zscaler provide broader and deeper coverage.
Unified Security Management
Microsoft 365 Defender provides a single management portal for endpoint, email, identity, and cloud app security. The unified incident view, automated investigation, and cross-domain correlation within the Microsoft ecosystem reduces operational overhead for security operations teams. This integration advantage is genuine — but only within the Microsoft boundary. Threats that span non-Microsoft systems require additional tooling and integration effort.
Where Microsoft Security Falls Short
Microsoft’s security stack has material capability gaps that are either absent from Microsoft’s sales narrative or acknowledged only in product roadmap commitments.
EDR Detection Depth
Defender for Endpoint P2 has improved significantly but consistently ranks behind CrowdStrike and SentinelOne in independent EDR evaluations (MITRE ATT&CK, SE Labs, AV-Comparatives) for detection accuracy, false positive rates, and response automation depth. Organisations in highly targeted sectors (financial services, critical infrastructure, defence) typically require best-of-breed EDR alongside or instead of Defender.
SIEM Cost & Maturity
Microsoft Sentinel is a capable cloud-native SIEM, but its consumption-based pricing (per GB ingested) creates unpredictable costs that scale with log volume, not user count. Enterprise Sentinel deployments routinely exceed initial cost projections by 30–60%. Splunk, Elastic Security, and Google Chronicle offer more predictable pricing models and more mature analytics, threat detection content, and SOC workflow integration.
Network Security
Microsoft does not offer an enterprise-grade network security platform comparable to Palo Alto Networks, Fortinet, or Zscaler. Azure Firewall and Network Security Groups provide basic cloud network controls, but enterprise network security — next-generation firewalling, SD-WAN, zero-trust network access (ZTNA), and network detection and response (NDR) — requires third-party solutions regardless of Microsoft security investment.
Vulnerability Management Depth
Defender Vulnerability Management provides basic asset discovery and vulnerability assessment, but lacks the depth, accuracy, and remediation workflow maturity of Tenable, Qualys, or Rapid7. Organisations with regulatory vulnerability management requirements (PCI DSS, SOX, DORA) typically require dedicated vulnerability management tooling that exceeds Defender’s current capability.
Third-Party & Multi-Cloud Coverage
Microsoft’s security telemetry is deepest within the Microsoft ecosystem. Coverage of non-Microsoft endpoints (Linux, macOS at scale), non-Azure cloud environments (AWS, GCP), and non-Microsoft SaaS applications is functional but shallower than best-of-breed alternatives designed for multi-platform environments. Organisations with heterogeneous environments consistently report coverage gaps in Microsoft’s non-Microsoft telemetry.
Security Operations Workflow
Microsoft’s security operations tooling (Sentinel SOAR, Defender automated investigation) is improving but remains less mature than established SOAR platforms (Palo Alto XSOAR, Splunk SOAR, Tines). SOC teams that have built operational workflows on mature SOAR platforms face significant effort to replicate those workflows in Microsoft’s environment, with current capability gaps in complex orchestration scenarios.
Three Unbundling Strategies
Three licensing architectures that deliver the security capabilities you actually need at 25–45% less cost than full Microsoft consolidation.
Selective Microsoft Security (E3 + Targeted Add-Ons)
Keep Microsoft where it excels (identity, email, cloud app security) and procure only the specific E5 Security add-on features required — for the users who need them. All users on E3 ($36/user/mo). E5 Security add-on ($12/user/mo) for IT, security, and high-risk roles only (20–30% of users). E5 Compliance add-on ($12/user/mo) for legal and compliance roles only (5–10%). Sentinel replaced with lower-cost SIEM (Elastic, Chronicle) or Sentinel on commitment tier with optimised data ingestion. Best-of-breed EDR (CrowdStrike) for endpoints requiring highest detection accuracy.
Blended security cost: $18–$26/user/mo versus $43+/user/mo for full Microsoft stack. Annual savings for 5,000 users: $510K–$1.02M.
Hybrid Stack (Microsoft Identity/Email + Best-of-Breed EDR/SIEM)
Use Microsoft’s strongest security domains (Entra ID P2 for identity, Defender for Office 365 for email, Defender for Cloud Apps for CASB) and deploy best-of-breed for every other domain. EDR: CrowdStrike or SentinelOne. SIEM: Splunk Cloud, Elastic, or Google Chronicle. Network security: Palo Alto or Zscaler. Vulnerability management: Tenable or Qualys. Compliance: targeted tooling for required roles only. This architecture plays to each vendor’s strengths and avoids paying for Microsoft capabilities that are weaker than alternatives.
Blended security cost: $15–$22/user/mo. Annual savings for 5,000 users: $630K–$1.26M.
Full Best-of-Breed (Microsoft for Productivity Only)
Use Microsoft exclusively for productivity (M365 E3) and deploy a complete best-of-breed security stack. Identity: Okta. EDR: CrowdStrike. Email security: Proofpoint. CASB: Netskope. SIEM/SOAR: Splunk or Elastic. Network: Zscaler. Vulnerability management: Tenable. This architecture eliminates all Microsoft security licensing premiums and provides best-in-class capability across every domain. It requires the most integration effort but delivers the lowest total security cost and the highest capability per dollar for multi-platform environments.
Blended security cost: $12–$20/user/mo. Annual savings for 5,000 users: $690K–$1.38M.
The optimal architecture depends on two variables: the organisation’s Microsoft ecosystem concentration (how much of the environment is Microsoft-only versus multi-platform) and the existing security tool investment (sunk cost in current vendor contracts, SOC team expertise, and operational workflows). Organisations with 80%+ Microsoft environments and minimal existing security tooling may genuinely benefit from Microsoft consolidation. Organisations with heterogeneous environments and mature existing security operations almost always achieve better outcomes with Strategy B or C.
The Sentinel Cost Problem
Microsoft Sentinel deserves special attention because its consumption-based pricing model creates the most unpredictable and frequently underestimated cost in the entire Microsoft security stack.
How Sentinel Pricing Works. Sentinel charges per GB of data ingested per day. Pay-as-you-go pricing is $2.46/GB/day. Commitment tiers (100GB/day minimum) reduce the rate to $1.23–$1.64/GB/day depending on volume. Free data sources include Azure Activity Logs, Office 365 Audit Logs, and alerts from Microsoft Defender products. Chargeable data sources include Windows Security Events, Syslog, Common Event Format (CEF), and any non-Microsoft telemetry. The ratio of free to chargeable data varies dramatically by environment.
The Data Volume Problem. Enterprise SIEM deployments generate 50–500+ GB/day depending on the number of data sources, log verbosity, and retention requirements. A mid-range enterprise ingesting 200GB/day at commitment tier pricing ($1.40/GB) pays $280/day — $102,200/year — for Sentinel alone. This is before Sentinel SOAR automation costs (Logic Apps consumption), workspace retention beyond 90 days ($0.10/GB/month), and data export charges. Total Sentinel costs at this scale typically reach $150K–$250K/year — and many enterprise environments generate significantly more data.
The Comparison Problem. When organisations compare Sentinel’s cost to alternatives, they frequently compare Sentinel’s commitment tier pricing to competitors’ list pricing. On a like-for-like basis with negotiated enterprise pricing, Splunk Cloud ($75–$130/GB/day, but often negotiated to $30–$60 for enterprise volumes), Elastic Security (self-managed with infrastructure cost, or Elastic Cloud at $15–$50/GB/day), and Google Chronicle (flat-rate pricing model) are frequently more cost-effective at enterprise data volumes — and offer more mature detection content, threat intelligence integration, and SOC workflow automation.
| SIEM Platform | Pricing Model | Cost at 200GB/day | Annual Cost (Est.) |
|---|---|---|---|
| Microsoft Sentinel | Per GB/day (commitment) | $280/day | $102K–$250K |
| Splunk Cloud | Per GB/day (negotiated) | $200–$400/day | $73K–$146K |
| Elastic Security | Self-managed or Cloud | Infrastructure-based | $40K–$120K |
| Google Chronicle | Flat rate (capacity-based) | Flat rate | $60K–$150K |
In 58% of Sentinel deployments reviewed by Redress, actual costs exceeded initial projections by more than 40%. The primary driver is data volume underestimation: organisations model Sentinel costs against Microsoft’s “free” data sources (Azure/M365 logs) and undercount the volume of chargeable sources (Windows events, network logs, third-party telemetry) that the SOC team subsequently connects. Once data sources are connected in production, reducing volume without reducing security visibility is operationally difficult.
Common Consolidation Traps
Eight traps that consistently lead organisations into more expensive security architectures than necessary.
1. Conflating E5 with Full Security
E5 includes E5 Security and E5 Compliance features but does not include Sentinel, Defender for Cloud, Entra ID Governance, or Copilot for Security. Organisations that upgrade to E5 for “security” discover additional consumption-based costs on top of the E5 premium. The total Microsoft security stack cost always exceeds the E5 subscription price.
2. Comparing List Prices
Microsoft’s consolidation TCO models compare Microsoft’s negotiated security pricing against competitors’ list pricing. Any valid comparison must use negotiated enterprise rates for all vendors. Best-of-breed vendors routinely discount 40–60% from list for enterprise agreements. Microsoft’s TCO advantage evaporates when like-for-like negotiated pricing is applied.
3. Ignoring Sunk Costs
Organisations with existing security tool contracts (often 2–3 year terms) face stranded investment when consolidating to Microsoft before contract expiry. The “savings” from consolidation must account for the remaining obligation on incumbent contracts. True savings often materialise only after incumbent contracts expire — which may be 12–24 months into the Microsoft consolidation.
4. Underestimating Sentinel Data Costs
Organisations that model Sentinel costs based on Microsoft’s free data sources (Azure/M365 logs) significantly underestimate production costs when the SOC team connects chargeable data sources. By the time the true cost is visible, the organisation has invested in Sentinel analytics rules, workbooks, and SOAR playbooks that create switching costs.
5. Assuming Wall-to-Wall Deployment
Microsoft’s per-user security licensing applies to every assigned user. Best-of-breed security tools can be licensed per endpoint, per asset, or per function — allowing targeted deployment for the users and systems that actually require each capability. Wall-to-wall Microsoft security licensing pays the same per-user rate for the CEO and the seasonal warehouse worker.
6. Ignoring the SOC Reskilling Cost
Migrating from established security tools (CrowdStrike, Splunk, Palo Alto) to Microsoft’s security stack requires SOC team reskilling, workflow reconstruction, detection rule migration, and operational process redesign. These migration costs are real, substantial, and typically not included in Microsoft’s consolidation TCO. For mature security operations, the reskilling cost can take 12–18 months to absorb.
7. Licensing Security for All Users
Not all users require E5-level security features. IT administrators, executives, and high-risk roles need advanced identity protection and endpoint security. Knowledge workers need standard protection (E3 provides substantial baseline security). Frontline workers may need minimal endpoint management only. Licensing security per user role, not per organisation, reduces cost by 30–50%.
8. No Independent Assessment
Microsoft’s security consolidation assessment is conducted by Microsoft’s sales team, whose compensation is tied to E5 Security conversions and Sentinel consumption growth. There is no scenario in which Microsoft’s assessment recommends reducing Microsoft security licensing. An independent assessment that evaluates Microsoft alongside alternatives, with validated pricing and capability comparison, is the prerequisite for any rational security architecture decision.
Recommendations
Seven priority actions for CISOs, CIOs, and procurement leaders evaluating Microsoft security consolidation.
Commission an Independent Security Licensing Assessment
Before accepting Microsoft’s consolidation narrative, produce an independent, domain-by-domain cost and capability comparison. Include Microsoft and best-of-breed alternatives for every security domain. Use negotiated enterprise pricing for all vendors. Include Sentinel consumption modelling, not just Microsoft’s free-tier projections. This assessment is the factual foundation for every subsequent decision.
Use Microsoft Where It Excels — Not Everywhere
Microsoft’s identity protection (Entra ID P2), email security (Defender for Office 365), and cloud app security (Defender for Cloud Apps) leverage native M365 integration that best-of-breed alternatives cannot match. Use Microsoft for these domains. For EDR, SIEM, network security, and vulnerability management, evaluate whether Microsoft’s offering meets your specific capability and cost requirements versus dedicated alternatives.
Model Sentinel Costs with Production Data Volumes
Do not accept Microsoft’s Sentinel cost projections based on free data sources. Model Sentinel costs using your actual production log volume across all data sources (Windows events, network logs, third-party telemetry, custom sources). Add 30–50% buffer for growth and data source expansion. Compare the fully modelled Sentinel cost against Splunk, Elastic, and Chronicle at equivalent volume.
License Security by User Role, Not per Organisation
Deploy E5 Security features for the 20–30% of users who genuinely require them (IT, security, executives, high-risk roles). Maintain E3 baseline security for the remaining 70–80%. This reduces the Microsoft security premium by 70–80% while maintaining equivalent protection for users whose risk profile does not justify E5-level features.
Negotiate Security Licensing Within the EA/MCA
Security add-ons, Sentinel commitment tiers, and Defender for Cloud capacity should all be negotiated as line items within the broader EA/MCA renewal. Bundled negotiation delivers 15–25% better pricing than standalone procurement. Include volume discounts, escalation caps, and bi-directional adjustment rights for all security subscriptions.
Create Competitive Leverage with Incumbent Tools
Before consolidating to Microsoft, negotiate with your existing security vendors. Inform them that Microsoft consolidation is under evaluation. Existing vendors will defend their installed base with significant pricing concessions — typically 25–40% below current rates. Even if you ultimately adopt Microsoft, the competitive tension improves Microsoft’s commercial flexibility. If you stay with incumbents, you achieve better pricing. Either outcome benefits the customer.
Engage Specialist Advisory Support
Security licensing decisions involve the intersection of cybersecurity architecture, licensing economics, vendor negotiation, and EA/MCA contract strategy. Microsoft’s sales team has a structural incentive to recommend consolidation. Incumbent vendors have a structural incentive to recommend retention. An independent advisor with no vendor affiliation provides the objective analysis required for a decision of this magnitude and complexity.
How Redress Compliance Can Help
Redress Compliance’s Microsoft Practice provides independent security licensing assessment, vendor consolidation analysis, and EA/MCA renewal negotiation. Our team has conducted 180+ security licensing assessments with zero vendor affiliation and an average cost reduction of 32% versus Microsoft’s initial consolidation proposal.
Security Licensing & Consolidation Services
- Independent security licensing assessment
- Microsoft vs. best-of-breed cost & capability comparison
- Sentinel consumption modelling & cost projection
- Security architecture design (unbundled & hybrid)
- E5 Security shelfware audit
- Compliance licensing rationalisation
- Security vendor competitive negotiation
- EA/MCA security licensing negotiation
- SIEM platform cost comparison
- Ongoing security licensing governance
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What to Expect
30-minute NDA-protected call. We’ll review your current security tooling, Microsoft licensing, and consolidation evaluation status.
We’ll provide a preliminary domain-by-domain comparison of Microsoft versus your current stack, with estimated savings ranges for each unbundling strategy.
You’ll leave with a clear assessment plan, expected cost outcomes, and a prioritised action sequence — no obligation.
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This document has been prepared by Redress Compliance for informational purposes. Redress Compliance is a fully independent software licensing advisory firm with zero vendor affiliations — including zero Microsoft, CrowdStrike, Splunk, Palo Alto, or any security vendor partnership. We do not resell security products or receive vendor commissions. Benchmark data is based on anonymised security licensing assessments. Past results are not a guarantee of future outcomes.
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