Business Premium up to 300 users, E3 for larger organizations, E5 for advanced security: a practical comparison to pick the right Microsoft 365 license without overpaying.
The question we get every week
“We pay for E3 — do we actually need it?” Or the opposite: “We're on Business Premium, are we limiting ourselves?” Choosing between Microsoft 365 Business Premium, E3 and E5 is one of the most structural IT budget decisions — and one of the most misunderstood, because Microsoft keeps evolving the lineups.
This guide compares the three licenses from the perspective of a Québec organization: real features, user thresholds, security requirements and Law 25 compliance. We deliberately don't publish a price grid: Microsoft pricing changes (the latest increase dates from July 2026) — check the current Canadian price list or ask us for an up-to-date analysis.
Business Premium: the best value up to 300 users
Microsoft 365 Business Premium is capped at 300 users. Below that threshold, it is almost always the right choice for a Québec SMB: it includes the full Office suite, Exchange, Teams and SharePoint, but above all the essentials of modern security — Intune for device management, Entra ID P1 for conditional access, and Defender for Business.
What often surprises people: Business Premium already covers most baseline cyber-insurance and Law 25 requirements (MFA, encryption, device management). Many SMBs pay for E3 without using what actually differentiates it from Business Premium.
- Up to 300 users, no exceptions
- Intune + Entra ID P1 + Defender for Business included
- Sufficient for most baseline cyber-insurance requirements
- Real limit: no advanced DLP or sophisticated retention (eDiscovery Premium, advanced Purview)
E3: when size or governance demand it
Microsoft 365 E3 becomes necessary in two cases: you exceed 300 users, or you have document governance and compliance needs that Business Premium doesn't cover — advanced retention, extended DLP, records management, Windows Enterprise licensing.
For organizations with strong documentary obligations (public sector, para-public, financial services), E3 is often the realistic entry point. One caveat: E3 does NOT include the advanced security tools (Defender for Endpoint P2, Defender for Office P2, Entra ID P2) — the most underestimated gap between E3 and E5.
E5: security and analytics at the next level
E5 adds what E3 lacks: full Defender XDR (Endpoint P2, Office P2, Identity), Entra ID P2 (identity protection, risk-based conditional access), advanced Purview (full DLP, Insider Risk), audio conferencing and Power BI Pro.
The right calculation is not “E5 vs E3” but “E5 vs E3 plus security add-ons bought separately”. If your organization needs Defender for Endpoint P2, Entra ID P2 and Power BI Pro, à-la-carte licensing often costs more than the step up to E5. That's the analysis we run before any recommendation — and in many cases, a targeted E3/E5 mix (E5 for sensitive roles, E3 for the rest) beats a uniform rollout.
The comparison at a glance
- Under 300 users, standard needs → Business Premium, almost always
- Over 300 users OR advanced document governance → E3
- High security requirements, SOC, demanding cyber-insurance, analytics → E5 or an E3/E5 mix
- Public sector and education: dedicated pricing (G, A) — the comparison changes completely
- In every case: audit actual usage before renewing — over-licensing is the first source of savings we find at our clients
How we can help
io4 runs Microsoft 365 licensing audits: actual per-user usage, gaps between licenses paid and features consumed, optimal-mix scenarios. It is often the highest-ROI intervention in an io4 360 contract — several clients fund their bank of hours with the savings.
Unsure about your current licensing? A 30-minute conversation is usually enough to tell whether an analysis is worth it.
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