The Microsoft 365 plan picker

Business Premium, in most cases under 300 staff: it bundles the desktop Office apps with the security stack that matters day to day — Intune device management, Defender for Business EDR, conditional access, phishing protection — at US$22 per user. The common mistakes are sitting on Business Standard without the security layer, or paying for E3 and getting less protection than Premium would have given.

Office 365 plans are the productivity apps and services only; Microsoft 365 plans add the security and device-management layer — Entra ID, Intune, Defender — and, on enterprise plans, Windows Enterprise licensing. In 2026 there's rarely a good reason to buy the older Office 365 E-plans: the security layer is where the value sits.

Yes — licensing is per-user and mixing is normal good practice: Business Basic for frontline staff, Business Premium for knowledge workers, E5 (or the E5 Security add-on) only for users with real exposure. The 300-seat cap applies to Business-plan seats, not the tenant. Rightsizing along these lines commonly cuts 10–30% from the Microsoft bill.

The Business plans are hard-capped at 300 seats. Beyond that, additional users need Enterprise (E3/E5) or Frontline (F3) licences. Existing Business-plan users can stay as they are, so growing firms usually add E3 seats past 300 rather than migrating everyone — though at larger scale a uniform enterprise agreement can price better.

As a blanket licence for an SME, rarely — US$60 per user buys advanced security, eDiscovery Premium and Teams Phone that most people never touch. It's worth it for specific user groups, or where it replaces a separate phone system, BI tool and EDR platform at once. For smaller firms the E5 Security add-on on Business Premium — US$12 for the E5 security stack, US$34 all-in versus US$60 — is often the smarter route.

On 1 July 2026 Microsoft raised enterprise list prices: E3 from US$36 to US$39, E5 from US$57 to US$60, and F3 from US$8 to US$10 — the steepest rise at 25%. The Business plans (Basic, Standard, Premium) were unchanged. Existing annual terms keep their price until renewal, which makes the month before your renewal the time to rightsize.

For organisations up to 300 seats, Microsoft 365 Copilot Business lists at US$21 per user per month (the US$18 promotion ended 30 June 2026); the enterprise price is US$30. It sits on top of a qualifying base licence — Business Standard, Business Premium, E3 or E5. At Hong Kong salaries it breaks even at roughly 15 minutes saved a week, but only for users whose work lives in email, meetings and documents — and only in a tenant whose permissions are clean enough to switch it on safely.

For most existing subscriptions, yes. Since 2024, new enterprise subscriptions are often sold with Teams unbundled — an E3/E5 "no Teams" SKU plus a separate Teams Enterprise add-on — so a new-customer CSP quote may show two lines where an old one showed one. The totals land close; just compare like with like when weighing quotes.

It depends what you're buying. If the pull is Teams, the Office desktop apps, or the Business Premium security stack (Intune, Defender, conditional access under one licence), the move usually pays for itself in consolidated tooling. If Workspace is working and none of that calls, there's no compliance reason to move — Hong Kong doesn't mandate either. When you do migrate, mail, files and identity move cleanly with planning.

Make it a conscious decision. Microsoft's retention and recycle bins protect against some deletion, but they are not backup: ransomware, malicious deletion and sync accidents can outrun them. Third-party Microsoft 365 backup is cheap relative to the data it protects; the failure mode isn't buying it or not — it's assuming you have it when you don't.

CSP buying gets you HKD billing, the ability to mix annual commitment (cheaper) with monthly seats (flexible, for temps and uncertainty), and a local human to call when licensing breaks — for the same list price. PTS buys as a Microsoft partner/CSP, so licensing, support and the monthly bill come through one point of contact.