Microsoft 365 Business Premium vs E3: which plan fits your Australian business?
Microsoft 365 Business Premium and Microsoft 365 E3 look deceptively similar on paper — both include the Office apps, Entra ID P1, Intune and a layer of Microsoft Defender. The differences show up in three places that matter for Australian businesses: the 300-user cap, the depth of the security stack and the post-July 2026 price.
Key takeaways
- Business Premium is the SMB sweet spot. For organisations under 300 seats, it bundles Entra ID P1, Intune, Defender for Business and Defender for Office 365 P1 at AUD $30-ish per user per month — a stack that would cost two to three times more assembled as add-ons.
- E3 is a licensing ceiling-raiser, not a security upgrade. E3 removes the 300-user cap but does not include endpoint detection and response by default. You will usually add Defender for Endpoint P1 or a Defender bundle on top.
- July 2026 makes the gap wider. Business Premium holds flat at USD $22. Microsoft 365 E3 rises 8% to USD $39. In Australian dollars the pricing delta between the two plans widens by roughly 10% from 1 July 2026.
- Mixing plans is legitimate and common. You can run Business Premium and E3 side by side in the same tenant, provided the Business family stays at or below 300 licences.
The short answer
If your business has fewer than 300 staff and your compliance obligations are Essential Eight, the Privacy Act and SMB1001 — stay on Microsoft 365 Business Premium. It is the single best-value SKU Microsoft has ever shipped for Australian SMBs and the July 2026 pricing update reinforces that position.
If you are over 300 users, running a regulated business (APRA CPS 234, CPS 230), or you need features like Power BI Pro, Phone System or advanced records management, you are heading to E3 — and often to E3 plus an add-on bundle.
What each plan includes
The comparison below reflects Microsoft’s July 2026 packaging, including the new capabilities being added to E3 (Defender for Office 365 Plan 1, expanded Intune) and the mailbox storage lift going into Business Premium.
| Capability | Microsoft 365 Business Premium | Microsoft 365 E3 (from July 2026) |
|---|---|---|
| User cap per tenant | 300 (across all Business plans) | Unlimited |
| USD list price (July 2026) | $22 per user per month | $39 per user per month |
| Office desktop apps (Word, Excel, PowerPoint, Outlook) | Yes | Yes |
| Exchange Online mailbox | Plan 1 (100 GB from July 2026) | Plan 2 (100 GB + archiving) |
| Teams, SharePoint, OneDrive | Yes | Yes |
| Identity — Entra ID P1 (Conditional Access, SSO) | Yes | Yes |
| Windows 11 Enterprise E3 upgrade rights | Yes | Yes |
| Intune (MDM + MAM) | Yes — Intune Plan 1 | Yes — Intune Plan 2 (with Remote Help, Advanced Analytics) |
| Defender for Business (EDR for SMB) | Yes — included | No — add-on required (Defender for Endpoint P1 or P2) |
| Defender for Office 365 | Plan 1 — included | Plan 1 — included from July 2026 |
| Azure Information Protection / Purview Information Protection | Yes (basic MIP) | Yes (basic MIP) |
| Data Loss Prevention (Exchange + endpoint) | Yes | Yes |
| Retention policies and basic eDiscovery | Yes | Yes |
| Records management, Customer Key, Information Barriers | No | No (E5 or Purview add-on) |
| Power BI Pro | No | No (E5 or Power BI Pro add-on) |
| Phone System / Audio Conferencing for Teams calling | No | No (E5 or Teams Phone add-on) |
Where the real security difference lives
This is the section most comparison articles get wrong. Business Premium actually carries a deeper out-of-the-box security stack than E3 — E3 is a “desktop, identity and mailbox” plan with only email threat protection built in. The endpoint detection and response that most Australian businesses now treat as table stakes is included in Business Premium via Defender for Business, but not in E3.
Practically, that means three things:
Endpoint detection and response. Business Premium’s Defender for Business covers threat and vulnerability management, attack surface reduction, next-generation antivirus, EDR and automated investigation and response — the SMB-trimmed equivalent of Defender for Endpoint. On E3, you are adding this on top, typically as Defender for Endpoint P1 (roughly USD $3 per user per month) or moving to E5. Factor this into any like-for-like price comparison.
Anti-phishing and safe links. Both plans now include Defender for Office 365 Plan 1 from July 2026 — Safe Attachments, Safe Links, anti-phishing impersonation protection. Before July 2026, E3 required this as an add-on. If you are on E3 today and not paying for Defender for Office P1 separately, July brings it in at no extra cost.
Identity and conditional access. Both plans include Entra ID P1, which is what enables Conditional Access policies, self-service password reset, and the phishing-resistant MFA patterns the ACSC recommends for Essential Eight ML2. What neither plan includes is Entra ID P2 — you need that for Privileged Identity Management and Identity Protection risk-based signals, which is an E5 feature or a P2 add-on.
Pricing in Australia — what July 2026 changes
Microsoft’s 2026 packaging update takes effect on 1 July 2026. It confirms:
- Business Premium holds flat at USD $22 per user per month. Mailbox bumps from 50 GB to 100 GB. Copilot Chat enhancements added at no extra cost.
- Microsoft 365 E3 rises from USD $36 to USD $39 per user per month (8%). Adds Defender for Office 365 Plan 1, Intune Remote Help, Intune Advanced Analytics, Intune Plan 2.
- Office 365 E3 (no Windows, no Intune) rises from USD $23 to USD $26 per user per month. Also picks up Defender for Office 365 Plan 1.
- Microsoft 365 E5 rises from USD $57 to USD $60 per user per month. Adds Security Copilot, Intune Endpoint Privilege Management, Microsoft Cloud PKI and Intune Enterprise Application Management.
Australian list prices track the USD figures with local FX adjustments and GST applied separately. Most Australian resellers are currently quoting Business Premium at the low-$30s per user per month and Microsoft 365 E3 at the low-$50s. From 1 July 2026, expect Business Premium to remain at the same local price and E3 to rise by roughly 8% in AUD. Existing customers stay on their current pricing until their next annual renewal, and Microsoft has committed to at least 30 days’ notice before renewal adjustments.
When Business Premium is the right call
Choose Microsoft 365 Business Premium if:
- Your headcount will stay under 300 for the foreseeable future.
- Your security baseline is Essential Eight ML1 or ML2, SMB1001 Bronze or Silver, or Privacy Act APP compliance.
- You do not need Power BI Pro, Teams Phone, or the Microsoft Purview compliance suite.
- You value having EDR, MDM, identity, MFA and email threat protection in a single SKU rather than assembled from three or four add-ons.
Most Australian SMBs — professional services firms, not-for-profits, hospitality venues, retailers, engineering consultancies — fit this profile cleanly.
When E3 is the right call
Choose Microsoft 365 E3 (usually plus an add-on bundle) if:
- You have 301+ users and have hit the Business family cap.
- You are an APRA-regulated entity subject to CPS 234 or CPS 230 and your risk appetite calls for Defender for Endpoint P2 + Entra ID P2.
- You run legal, healthcare or financial services workloads that need records management, advanced eDiscovery, Customer Key or Information Barriers.
- You are already paying for Power BI Pro or Teams Phone separately and the bundle maths favour E5 over E3+add-ons.
The honest version: many organisations who “should be on E3” would be better served on Business Premium plus targeted Defender or Purview add-ons until they actually cross the 300-user line. E3 without Defender for Endpoint is a weaker security posture than Business Premium — and that is rarely what the buyer intends.
The mixed-plan option
Microsoft explicitly supports mixing Business and Enterprise plans in one tenant. The practical pattern we see in 250–400 user Australian organisations is:
- Core knowledge workers on Business Premium (up to 300 licences).
- Frontline or shift staff on Microsoft 365 F3 for the desk-less, uniformed, or production roles.
- A small pool of E3 or E5 licences for executives, finance and compliance staff who need Power BI Pro, advanced eDiscovery, or insider-risk tooling.
At the 300-user Business cap, you have two decisions to sequence: do you redistribute Business Premium licences to squeeze under the cap (F3 for frontline, Business Premium for the rest), or do you migrate the whole tenant to E3/E5? The first option preserves value; the second simplifies licensing. Either is valid — the wrong move is staying on a mismatched plan mix because no one wants to run the project.
How this maps to Australian compliance frameworks
Two frameworks drive most Microsoft 365 licence decisions for Australian businesses:
ACSC Essential Eight. Business Premium configured well hits ML1 easily and most of ML2. For ML2 and ML3 you need Windows Defender Application Control deployed via Intune, phishing-resistant MFA across all admin accounts (passkeys or FIDO2 keys), and mature patching telemetry. Those are configuration projects, not licence upgrades — Business Premium has the underlying components. See our SMB1001 vs Essential Eight comparison for how the two frameworks interact.
APRA CPS 234 and CPS 230. Superannuation funds, banks, insurers and registered financial advice firms face harder ground. CPS 234’s incident notification requirements and CPS 230’s operational resilience obligations effectively push regulated entities toward Defender for Endpoint P2 level telemetry, which lives in E5 or in E3 plus the Defender add-on bundle. Business Premium will not meet the evidential bar for an APRA-regulated mid-market.
Privacy Act and the Notifiable Data Breaches scheme. Both plans give you enough audit logging and identity signals to investigate and report breaches inside the 30-day OAIC window. The OAIC’s January–June 2025 report recorded 532 notifications with roughly 20% attributable to credential compromise — the identity and conditional access features in both plans are precisely what reduces that attack surface.
See our MFA vs passkeys vs SSO guide for how to configure the identity layer under either licence, and our glossary entries for MFA and SSO for the underlying definitions.
Frequently asked questions
Can I mix Microsoft 365 Business Premium and E3 in the same tenant?
Yes. Microsoft lets you combine Business and Enterprise plans in a single tenant. The only constraint is the 300-user cap on the Business family as a whole — Business Basic, Business Standard and Business Premium licences share that ceiling. If you are at 320 users you can keep 300 on Business Premium and run 20 on E3, but the day the tenant grows you will need to plan the full migration path.
Does Microsoft 365 Business Premium meet Essential Eight Maturity Level 1?
Yes, when configured correctly. Business Premium ships with Entra ID P1 (for Conditional Access and phishing-resistant MFA), Intune (for patching and device hardening), Defender for Business (for EDR) and Defender for Office 365 Plan 1 (for email and link protection). Those four pillars cover most of the Essential Eight ML1 controls. ML2 and parts of ML3 are achievable on the same licence with careful configuration and application control via Windows Defender Application Control.
What is changing with Microsoft 365 pricing in July 2026?
Microsoft has confirmed a pricing and packaging update effective 1 July 2026. Business Premium holds at USD $22 per user per month with a 50 GB mailbox bump and Copilot Chat enhancements added. Microsoft 365 E3 rises from USD $36 to USD $39 per user per month (+8%) and picks up Defender for Office 365 Plan 1, Intune Remote Help, Intune Advanced Analytics and Intune Plan 2. Australian pricing follows with local FX adjustments — most Australian resellers expect a proportional local increase on E3 and flat pricing on Business Premium.
When is it worth upgrading from Business Premium to E5 instead of E3?
Jump to E5 when you need the full Microsoft Purview suite (records management, Customer Key, Information Barriers, Insider Risk Management), Defender for Endpoint Plan 2, Defender for Identity, Power BI Pro built in, or Phone System for Teams calling. Many Australian financial services, legal and healthcare organisations with APRA CPS 234 or CPS 230 obligations land on E5 — or on E3 plus a Defender and Purview add-on bundle — because the advanced eDiscovery and insider-risk tooling is not available on Business Premium.
Authoritative resources and Australian compliance guidance
- Microsoft 365 Pricing and Packaging Updates — July 2026 — primary source for USD list prices and the feature additions going into each SKU.
- Microsoft 365 and Office 365 plan options — Service Descriptions — the authoritative feature matrix, including the 300-user Business family footnote.
- ACSC Essential Eight — the framework most Australian SMB licence decisions map back to.
- Microsoft Learn — Achieving Essential Eight MFA ML1 with Entra ID — the official Microsoft / ACSC alignment guidance for the identity controls in both Business Premium and E3.
- APRA CPS 234 Information Security — obligations that push regulated entities from Business Premium toward E3 / E5 + Defender add-ons.
- OAIC Notifiable Data Breaches report, January–June 2025 — the breach-profile data that frames why identity and endpoint protection matter for Australian businesses of any size.
Not sure which plan fits your business? All IT Services runs a no-obligation Microsoft 365 licensing review for Australian SMBs — we look at your current licence mix, usage telemetry and compliance obligations and tell you whether the move to E3 pays for itself. Book a 30-minute call or browse our case studies for how other Australian businesses have handled the same decision.
Related comparisons and resources
MFA vs passkeys vs SSO: what’s right for your business
From the IT Glossary: Microsoft 365 • Microsoft Entra ID • Conditional Access • Browse all 182 terms