Microsoft 365 E3 vs E5:
When the Upgrade Is Actually Worth It

Microsoft 365 E3 vs E5: What You Are Actually Paying For

Microsoft 365 E3 costs $36 per user per month, rising to $39 in July 2026. E5 costs $57 per user per month, rising to $60. That $21 gap compounds fast: for a 2,000-seat enterprise, upgrading everyone from E3 to E5 adds $504,000 annually — before the July 2026 price increase locks in even higher numbers. Yet analysts consistently find that nearly 50% of E5 licences in large organisations are either inactive (23%) or completely unassigned (27%). The question is never simply "E3 or E5?" — it is "which users genuinely need E5, and what is the cheapest way to get its specific capabilities for everyone else?"

Redress Compliance has worked across 500+ enterprise Microsoft engagements. The pattern is consistent: Microsoft's commercial team pushes whole-estate E5 upgrades because that maximises their revenue. The buyers who get the best outcomes treat E5 as a targeted deployment for specific user cohorts — security teams, compliance officers, executives, and voice users — while keeping the broader population on E3 or E3 with targeted add-ons. Before committing to any tier decision, use our Microsoft EA renewal readiness assessment to baseline your current exposure and identify where E5 value can be realised versus where it is wasted.

Full Feature Comparison: Microsoft 365 E3 vs E5

E3 provides the full productivity suite — Office apps, Teams, Exchange Online, SharePoint, OneDrive — alongside basic security controls including Microsoft Defender Antivirus, basic Data Loss Prevention (DLP) for Exchange and SharePoint, and Microsoft Entra ID P1 for conditional access. It covers Intune for device management and Defender for Business at the core level. For most general information workers, E3 delivers everything needed for day-to-day operations.

E5 adds four capability pillars on top of E3. First, advanced security: Microsoft Defender for Endpoint Plan 2 (EDR, automated investigation, threat hunting), Defender for Office 365 P2 (attack simulation training, advanced threat tracking), Defender for Identity (hybrid identity threat detection), and Defender for Cloud Apps (CASB functionality). Second, advanced compliance: Microsoft Purview Insider Risk Management, Communication Compliance, Advanced eDiscovery Premium with custodian management, Advanced Audit with 12-month log retention, and Endpoint DLP that extends data protection to Windows and macOS device activity. Third, telephony: Teams Phone with full PBX capability is included in E5 at no additional charge, replacing separate telephony infrastructure. Fourth, analytics: Microsoft Entra ID P2 for Privileged Identity Management and risk-based conditional access, plus the Sentinel data ingestion grant of 5 MB per user per day.

Security: The Core Justification for E5 Spending

The strongest financial case for E5 sits in the security stack — specifically the Defender for Endpoint P2 capability. Under E3, organisations have Defender for Endpoint P1, which covers next-generation protection and attack surface reduction. Under E5, P2 adds endpoint detection and response (EDR), automated investigation and remediation, threat and vulnerability management, deep threat analytics, and advanced hunting via KQL queries. Purchased as a standalone add-on, Defender for Endpoint P2 costs $5.20 per user per month. Combined with Defender for Office 365 P2 ($5.00), Defender for Identity ($5.50), and Defender for Cloud Apps ($3.50), the individual Defender stack totals $19.20 per user per month on top of E3 — more than the $21 full E5 uplift if purchased piecemeal.

This is where Microsoft's E5 Security add-on becomes relevant. At $12 per user per month added to an E3 base, it delivers the full Defender suite (Endpoint P2, Office 365 P2, Identity, and Cloud Apps) without requiring the compliance, telephony, and analytics components of full E5. For enterprises that need the security capability but do not have a significant telephony or eDiscovery use case, the E5 Security add-on route costs $48 per user per month versus $57 for full E5 — a $9 saving per user per month, or $216,000 annually for a 2,000-seat estate. Our detailed analysis of Microsoft Defender XDR licensing explains exactly how the bundled and add-on options compare for enterprise security buyers.

Microsoft 365 E3 vs E5 Comparison: Compliance and eDiscovery

For organisations in regulated industries — financial services, healthcare, legal, energy — the compliance additions in E5 can be the deciding factor. Advanced eDiscovery Premium in E5 supports full custodian management, legal hold workflows, near-duplicate detection, and conversation threading for Teams messages, making it substantially more capable than the basic eDiscovery available in E3. Advanced Audit extends log retention to 12 months (versus 90 days in E3) and enables custom retention policies up to 10 years — a material difference for organisations facing SEC, FCA, GDPR, or HIPAA obligations.

Insider Risk Management is the compliance feature most enterprises underestimate at purchase and then find they cannot easily replicate with third-party tools. It detects departing employee data exfiltration, policy violations, and sensitive information misuse using ML-driven analysis of endpoint and communication activity. Communication Compliance addresses MiFID II and FCA financial communications monitoring requirements directly, scanning Teams, Exchange, and third-party platforms for regulatory violations. If these capabilities map directly to your compliance obligations, E5 is straightforwardly justified. If they do not, you are funding compliance infrastructure you will never deploy. Our Microsoft 365 E3/E5 negotiation toolkit provides the decision framework to make this call objectively.

Teams Phone: The Often-Overlooked E5 ROI Driver

Teams Phone — Microsoft's full PBX replacement capability — is included in E5 at no additional charge. Enterprises still running legacy PBX infrastructure or paying per-user telephony costs through a separate UCaaS provider should model this as a direct cost offset. A global firm with 2,000 users saved 20% annually on telephony costs by enabling Teams Phone (included in their E5 upgrade) and phasing out their incumbent PBX contract. When telephony is in scope, the incremental E5 cost needs to be measured net of what you will cease paying elsewhere — the gross $21 uplift is rarely the right number.

Teams Phone Standard as a standalone add-on costs $8 per user per month on top of E3. Audio Conferencing costs an additional $4. If telephony is the primary driver, an E3 + Teams Phone + Audio Conferencing approach at $48 per user per month matches E5 functionality for communications purposes while avoiding unneeded E5 compliance features. However, if you are also purchasing the E5 Security add-on ($12), the economics shift: E3 + Security add-on + Teams Phone + Audio Conferencing = $60 per user per month, exceeding full E5 at $57. This is the crossover point where full E5 becomes the efficient choice.

The Licence Utilisation Problem: Why 50% of E5 Sits Idle

Research consistently finds that 50% of Microsoft 365 E5 licences in enterprise environments are either inactive or unassigned — and that 56% of all Microsoft 365 licences are not fully exploited. At an E5 cost of $57 per user per month, that represents extraordinary waste at scale. The problem is structural: organisations upgrade to E5 under Microsoft commercial pressure at renewal, with a vague intention to activate capabilities over time. Deployment never happens because E5's advanced features require specialist implementation — Defender XDR requires security operations resources, Insider Risk requires privacy governance, Teams Phone requires network and telephony engineering. The licence cost lands on day one; the value takes 12–18 months to realise, if at all.

A large enterprise with 5,000 users discovered during a Redress review that only 1,000 users actually required E5 features. By restructuring their deployment — keeping 4,000 users on E3 and deploying E5 (or the E5 Security add-on) only for those with genuine security and compliance requirements — they recovered significant licence spend. The key is segmenting your user population by function before any tier decision: security and SOC analysts, compliance officers, executives with elevated data risk, and voice users form the natural E5 cohort. Everyone else requires an honest assessment.

Microsoft 365 E3 vs E5: The Negotiation Landscape in 2026

Microsoft's commercial team typically presents the E3-to-E5 upgrade as a simple choice between a price increase on current licensing or an upgrade to E5. This framing serves Microsoft's revenue objectives, not yours. The actual negotiating landscape is considerably broader. A mixed licensing model — E3 base with targeted E5 or E5 Security add-ons for specific user groups — is both commercially and technically viable and gives you legitimate negotiating leverage because it forces Microsoft to defend the marginal value of whole-estate E5.

Useful negotiation tactics include: requesting swap rights that allow you to convert E5 licences back to E3 mid-term based on actual activation metrics; tying any E5 commitment to deployment milestone-based payment structures; securing price protection across the full agreement term (particularly relevant given the July 2026 price increase); and modelling competitive alternatives — your Salesforce, SAP, or Workday vendors' collaboration and security stacks — as genuine leverage points. For the full negotiation framework, including clause-by-clause guidance on how Microsoft EA agreements should be structured for a mixed-tier deployment, see our Microsoft EA vs MCA-E comparison guide. Our detailed coverage of Microsoft NCE price lock strategy is also essential reading if your Microsoft purchasing moves through a CSP channel.

Download our Microsoft EA Renewal Playbook for the complete framework used across our 500+ Microsoft engagements, including the specific ask structures that consistently deliver 15–30% reductions on Microsoft EA renewals. To assess your specific negotiation position before your next renewal, book a confidential call with our Microsoft advisory team.

Microsoft Copilot and the E5 Licence Question

Microsoft 365 Copilot — the AI assistant add-on priced at $30 per user per month — sits across both E3 and E5 as an optional add-on. However, certain Copilot capabilities (particularly those using Microsoft Purview data classification and sensitivity labels for AI-generated content governance) require E5 Compliance features. Enterprises evaluating a Copilot deployment need to map which Copilot features require which underlying tier. Our companion guide on Microsoft Copilot licensing in 2026 covers the full dependency map across M365 Copilot, Copilot Studio, GitHub Copilot, and Azure OpenAI Service, and the negotiation tactics specific to the Copilot add-on market.

E3 vs E5: The Decision Framework

The most common mistake in E3/E5 decisions is applying a single tier to an entire workforce. The right framework starts by segmenting users into four cohorts. Cohort one: security and IT operations staff who need Defender XDR, advanced hunting, and threat intelligence — these are E5 or E5 Security add-on users. Cohort two: compliance, legal, and HR staff who need Advanced eDiscovery, Insider Risk, or Communication Compliance — E5 Compliance users. Cohort three: executives and high-risk roles where both security and compliance requirements overlap — full E5. Cohort four: standard information workers — E3 base. Model the per-seat cost for each cohort against the full E5 alternative, then test whether the mixed deployment saves more than the operational overhead of managing multiple tiers. In most enterprises above 1,000 seats, it does — often by $1M or more annually.

If your renewal is approaching, the timing of this analysis matters. Microsoft's commercial team is most flexible in the final 90 days before agreement expiry when quota pressure is highest. Walking into that window with a clearly modelled mixed-tier proposal, backed by utilisation data and competitive alternatives, is the most effective posture. Redress Compliance supports this entire process — from licence baseline to final term negotiation. To understand what this looks like in practice, explore our Microsoft Knowledge Hub or view our full range of Microsoft advisory services. When you are ready to act, use our Microsoft true-up risk assessment to identify exposure before your next review period.

The July 2026 Microsoft Price Increase: How It Changes the E3 vs E5 Calculus

Microsoft's July 2026 price increase raises E3 from $36 to $39 per user per month and E5 from $57 to $60. The absolute gap remains $21, but the percentage gap narrows slightly — E5 moves from 58% more expensive than E3 to 54% more expensive. More importantly, organisations that have not locked in their agreement pricing before the July 2026 effective date will absorb an 8.3% increase on E3 and a 5.3% increase on E5. For a 5,000-seat estate entirely on E3, that represents an additional $180,000 per year in licence cost with no change in capability.

The price increase creates a narrow but genuine window for negotiation leverage. Microsoft needs Q3 and Q4 2025 renewal bookings to hit its fiscal year targets before the new pricing takes effect. Enterprises whose agreements expire in the 12 months following July 2026 should approach their renewal in late 2025 — when Microsoft's motivation to close deals at current pricing is highest. For step-by-step guidance on timing your renewal to maximise this leverage, our Microsoft true-up negotiation guide covers the optimal renewal window and the specific asks that generate the best outcomes.

Crucially, the price increase affects CSP-channel purchasing differently from direct EA arrangements. If your Microsoft licensing flows through a reseller under the New Commerce Experience framework, the price lock mechanics are governed by NCE annual commitment terms rather than your EA anniversary date. Understanding whether your current NCE commitments protect you from the July 2026 increase — or expose you to mid-year repricing — is the first analytical step. Our Microsoft NCE price lock strategy guide maps this in detail.

Microsoft Entra ID P2: The Often-Overlooked E5 Identity Capability

Most E3/E5 comparison analyses focus on Defender and Purview while underweighting the identity capabilities added in E5. Microsoft Entra ID Plan 1 (included in E3) provides conditional access, single sign-on, and basic multi-factor authentication management. Entra ID Plan 2 (included in E5) adds Privileged Identity Management (PIM), Identity Protection with risk-based conditional access, and Access Reviews — capabilities that are material for enterprises managing privileged accounts, service principals, and third-party access at scale.

Entra ID P2 purchased as a standalone add-on costs $6 per user per month. For organisations that have experienced identity-based breaches, are subject to CIS Controls or SOC 2 requirements demanding PIM, or manage complex B2B guest access scenarios, this add-on cost is straightforwardly justified. In the E5 bundle, it is included at no marginal cost. Enterprises modelling a targeted E5 Security add-on for security staff should assess whether their broader workforce also needs Entra P2 — if so, the all-in cost of E3 + E5 Security add-on + Entra P2 (at $54/user/month) once again approaches full E5 territory, and the full-upgrade economics reassert themselves.

Frequently Asked Questions: Microsoft 365 E3 vs E5

Does Microsoft 365 E5 include Teams Phone?

Yes. Teams Phone with full PBX capability is included in E5 at no additional charge. Enterprises still paying for a separate UCaaS platform or legacy PBX contract should model Teams Phone adoption as a direct cost offset when evaluating E5. You will still need a calling plan (typically $12/user/month) for external PSTN connectivity, but the platform licence itself is included in E5.

Can you mix E3 and E5 licences in the same Microsoft 365 tenant?

Yes. Microsoft 365 supports mixed-tier deployments within a single tenant. Users on different licence levels see different features, and administrators manage both tiers through a unified admin centre. The operational overhead of managing mixed tiers is minimal in practice — the complexity arises in ensuring that users are assigned the correct tier for their role, which requires an ongoing governance process rather than a one-time configuration.

Is the Microsoft E5 Security add-on available without a full E3 base?

No. The E5 Security add-on ($12/user/month) requires an underlying Microsoft 365 E3 or Microsoft 365 F3 base licence. It is not available as a standalone product. Similarly, the E5 Compliance add-on ($12/user/month) requires the same base and delivers Purview Insider Risk, Communication Compliance, Advanced eDiscovery, and Advanced Audit without the Defender security stack.

What happens to E5 licences that go unused?

Unused E5 licences represent pure cost with zero return. Microsoft does not provide automatic refunds or credits for under-utilised seats. Under EA terms, you are typically committed to the licence volume agreed at signature for the full agreement term (usually three years). This is why right-sizing your deployment before committing is critical — reassigning over-purchased E5 licences to E3 mid-agreement is possible but requires a contract amendment that Microsoft has no incentive to facilitate without commercial concessions from you. Use our Microsoft 365 licence optimisation calculator to model your current utilisation before your next renewal conversation.