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For most businesses under 300 staff, Microsoft 365 Business Premium is the right licence: it bundles the Office apps with the security stack (Intune, Defender for Business, Entra ID P1) at roughly a third of the E5 price. You move to E3 when you pass the 300-user cap or need enterprise compliance tooling, and to E5 when you genuinely need the advanced security suite, eDiscovery Premium or Teams Phone. This guide explains the differences, the 2026 prices — including the increase coming on 1 July 2026 — and how to mix licences so you stop paying for features nobody uses.
Licensing is one of the biggest controllable costs in an IT budget — we see the consequences of getting it wrong constantly in IT budget planning and procurement work.
Key point
For most businesses under 300 staff, Business Premium is the right licence — Office apps plus the full security stack at about a third of the E5 price. Only move up when you hit the 300-user cap or genuinely need enterprise compliance or advanced security.
First, untangle the names
Two distinctions cause most of the confusion:
- Office 365 vs Microsoft 365. Office 365 plans (such as Office 365 E3) are the productivity apps and services only. Microsoft 365 plans add the security and device-management layer — Entra ID, Intune, Defender — and, in the enterprise plans, Windows Enterprise licensing. In 2026 there is rarely a good reason for a business to buy Office 365 E3 over Microsoft 365 E3; the security layer is where the value sits.
- Business vs Enterprise. The Business plans (Basic, Standard, Premium) are capped at 300 users and are priced for SMEs. The Enterprise plans (E3, E5) have no cap and add compliance and security depth. The cap is a hard one: user 301 needs an Enterprise (or Frontline) licence.
The 2026 prices
List prices in USD per user per month on annual commitment, with approximate Hong Kong dollar equivalents. Note the 1 July 2026 increase on the enterprise plans:
| Plan | Until 30 June 2026 | From 1 July 2026 | What it is |
|---|---|---|---|
| Business Basic | US$6 (≈HK$47) | unchanged | Web/mobile Office, email, Teams — no desktop apps |
| Business Standard | US$12.50 (≈HK$98) | unchanged | Desktop Office apps, email, Teams, SharePoint |
| Business Premium | US$22 (≈HK$172) | unchanged | Standard + Intune, Defender for Business, Entra ID P1, Defender for Office 365 P1 |
| Microsoft 365 E3 | US$36 (≈HK$281) | US$39 (≈HK$304) | Enterprise suite + Windows Enterprise, core Purview compliance, no 300 cap |
| Microsoft 365 E5 | US$57 (≈HK$445) | US$60 (≈HK$468) | E3 + advanced security, eDiscovery Premium, Entra ID P2, Teams Phone, Power BI |
Actual pricing in Hong Kong comes through your reseller/CSP agreement and moves with the USD list; treat the HKD figures as orientation. If you are renewing an enterprise agreement, doing it before 1 July 2026 locks the lower price for the term.
Tip
Renewing an enterprise agreement before 1 July 2026 locks the current, lower price for your whole term. If a renewal is due in the second half of the year, it is usually worth bringing it forward.
What each plan actually gets you
Business Premium — the SME default
Everything in Business Standard, plus the parts that determine whether a security incident is an inconvenience or a disaster:
- Microsoft Intune — device management for company and BYOD devices
- Microsoft Defender for Business — endpoint detection and response (EDR), not just antivirus
- Entra ID P1 — conditional access (the control that makes MFA enforceable in practice)
- Defender for Office 365 P1 — phishing and malicious-attachment protection beyond the basics
- Purview essentials: sensitivity labels, basic DLP, litigation hold
This is the licence we deploy in most Microsoft 365 builds for Hong Kong businesses, and the security stack it bundles maps directly onto the controls that matter against the phishing attacks targeting Hong Kong businesses. Bought separately, the components cost far more than the US$9.50 step up from Business Standard — that delta is the best-value spend in the entire Microsoft catalogue.
E3 — when you outgrow Business
Microsoft 365 E3 makes sense in three situations:
- Headcount. You are over (or will pass) 300 users.
- Windows licensing. E3 includes Windows 10/11 Enterprise — relevant if your fleet strategy depends on it (see Windows 10 end of support).
- Compliance depth. Core Microsoft Purview capabilities — longer audit retention, records management, standard eDiscovery — that regulated businesses need.
What E3 does not include surprises people: no Defender for Office 365, no Defender for Endpoint Plan 2, no Entra ID P2. A Business Premium tenant is in several respects better defended out of the box than a plain E3 tenant — E3 buyers are expected to add security à la carte or step to E5.
E5 — security, compliance and voice
The E5 premium (US$21–24/user/month over E3) buys three things:
- The full security suite: Defender for Endpoint P2, Defender for Cloud Apps, Insider Risk Management, Entra ID P2 (risk-based conditional access, privileged identity management)
- Compliance Premium: eDiscovery Premium, Communication Compliance, advanced Purview
- Teams Phone (a PBX replacement) and Power BI included
E5 is rarely the right blanket licence for an SME — but it is often right for a subset of users (see mixing, below). For businesses with regulatory exposure, the E5 security stack is also available as the E5 Security add-on on top of Business Premium — a fraction of full E5 and one of the quieter bargains in the catalogue.
Mix licences — the optimisation most businesses miss
Microsoft licensing is per-user, and nothing requires uniformity. The patterns that save real money:
- Business Premium for knowledge workers + Business Basic for frontline/warehouse staff who only need email and Teams on a phone.
- E3/E5 for the regulated few + Business Premium for everyone else in firms where only the deal team or finance function needs eDiscovery Premium or insider-risk tooling.
- Don’t pay for Teams Phone twice. If you run a third-party phone system, E5’s voice component is dead weight — and conversely, if you are paying for a separate PBX and considering E5, consolidate.
Rightsizing reviews routinely cut 10–30% from the Microsoft bill — usually by removing duplicated third-party tools (EDR, backup MFA, e-signature, BI) that a licence already includes, and by matching tiers to actual roles. It is the first thing we look at in a virtual CIO engagement.
Hong Kong and cross-border notes
- Buy through a CSP partner for monthly flexibility and local support in HKD billing, rather than credit-card direct.
- China operations change the picture. A global tenant licence does not transfer to the separate 21Vianet-operated China cloud — if you have Mainland staff, read our Microsoft 365 in China decision guide before standardising.
- Copilot is licensed separately on top of any of these plans — see our companion guide on whether Copilot is worth it.
Microsoft 365 licensing FAQs
What is the difference between Microsoft 365 Business Premium and E3?
Business Premium (US$22/user/month, up to 300 users) bundles the Office apps with Intune, Defender for Business, Entra ID P1 and Defender for Office 365 P1 — a strong security baseline for SMEs. Microsoft 365 E3 (US$36, rising to US$39 from July 2026) removes the user cap and adds Windows Enterprise licensing and deeper Purview compliance, but does not include several of Business Premium’s security components — those are à-la-carte or E5 features. Under 300 users with no enterprise-compliance requirement, Business Premium is usually the better-defended and cheaper choice.
Can I mix Microsoft 365 licence types in one tenant?
Yes. Licensing is per-user and mixing is normal good practice: Business Basic for frontline staff, Business Premium for knowledge workers, and E3 or E5 only for users who need enterprise compliance or advanced security. The 300 cap applies to the Business-plan seats, not the tenant. Rightsizing reviews along these lines commonly reduce Microsoft spend by 10–30%.
What happens when my business passes 300 users?
The Business plans are hard-capped at 300 seats each. Beyond that, additional users need Enterprise (E3/E5) or Frontline (F-series) licences. Existing Business-plan users can stay licensed as they are, so the practical pattern for a growing firm is to add E3 seats beyond 300 rather than migrating everyone — though at larger scale a uniform enterprise agreement may price better.
Is Microsoft 365 E5 worth it?
As a blanket licence for an SME, rarely — the US$57 (soon US$60) price buys advanced security, eDiscovery Premium and Teams Phone that most users never touch. It is worth it for specific user groups with regulatory or security exposure, or where you would otherwise buy a separate phone system, BI tool and EDR platform — at which point E5 can be cheaper than the pieces. The E5 Security add-on on Business Premium is often the smarter route for smaller firms.
Are Microsoft 365 prices going up in 2026?
Yes — Microsoft’s enterprise-plan list prices increase on 1 July 2026: E3 from US$36 to US$39 and E5 from US$57 to US$60 per user per month, with the Business plans (Basic, Standard, Premium) unchanged. Renewing an annual term before that date locks the current price for the term.
How PTS helps
PTS designs, licenses and runs Microsoft 365 for businesses across Hong Kong — from first-time setup with security configured from day one, to security reviews and hardening of existing tenants, to licence rightsizing as part of IT advisory. We buy as a Microsoft partner/CSP, so licensing, support and the monthly bill come through one local point of contact.
If you need help or advice related to this topic please get in touch with us here.
PTS Consulting provides managed IT support, structured cabling, audiovisual design and installation, and IT consultancy services for businesses across Hong Kong, Mainland China and Singapore.
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