Microsoft 365 Licensing Explained for New IT Administrators UK 2026
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The core problem new IT admins face with Microsoft 365 licensing
If you're new to managing Microsoft 365 for your organisation, licensing is probably the single most confusing and costly area you'll touch. Most new administrators inherit existing deployments or are brought in to manage licences nobody fully understands. You'll see names like E3, E5, Business Standard, Apps for Enterprise scattered across your tenant. You might not know whether your CEO actually needs an E5 licence or if you're paying for features nobody uses. Worse, you could be breaching compliance because you've assigned the wrong SKU to someone handling sensitive data.
Here's the truth: once you understand the core tiers and how they map to real job roles, Microsoft 365 licensing becomes straightforward. This guide walks you through exactly what each major licence includes, which users should get which plan, and how to cost-plan for your UK organisation in 2026.
The three main licensing families: Business, Standard, and Enterprise
Microsoft 365 comes in three distinct product families, each aimed at different organisation sizes and complexity needs.
Business plans (Microsoft 365 Business Basic, Standard, Premium)
These are built for small to medium organisations, typically under 300 users, though many larger firms use them for cost control.
Business Basic is the entry point. It includes cloud storage (1TB per user), web and mobile versions of Office apps (Word, Excel, PowerPoint, Outlook), plus Teams and OneDrive. It costs around £6 per user per month. No desktop versions of Office, no advanced security features, no Power BI or Project. If your user only needs email, document collaboration and Teams calls, this works.
Business Standard adds the desktop versions of Office apps (the full, rich versions you run locally) plus cloud storage and all the collaboration tools. It's roughly £12 per user per month. Most small businesses find this the sweet spot. The desktop apps matter for users doing heavy document work.
Business Premium is the full small business package: desktop Office, advanced security features including Defender for Business, device management basics, and business-class email. Around £20 per user per month. Good for organisations handling sensitive client data or managing devices across staff.
Standard plans (Microsoft 365 Apps for Enterprise, Microsoft 365 Standard)
If you work for a larger organisation but want a lightweight licensing tier, Standard plans exist. Microsoft 365 Standard (around £7 per user per month) gives you cloud-only Office with Teams and 1TB storage, similar to Business Basic but positioned for enterprise users. This is less common in the UK and sits in an awkward middle ground.
More important is Microsoft 365 Apps for Enterprise (about £7 per user per month), which is just the desktop Office suite plus OneDrive cloud storage. No email, no Teams. Used when your organisation has its own email system or uses standalone Outlook. Many NHS trusts and legacy on-premises organisations use this.
Enterprise plans (E1, E3, E5)
These are the core offerings for larger organisations, healthcare systems, universities, and government.
E1 (around £8 per user per month) is cloud-only Office, Teams, OneDrive, and basic Outlook web. No desktop Office, no advanced security. Rare in practice because E3 isn't much more expensive.
E3 (around £20 per user per month) is the workhorse. Desktop Office, Teams, Outlook, OneDrive, SharePoint, Power BI (read-only), Advanced Threat Protection, basic compliance tools, and device management. Most organisations license most knowledge workers on E3. If you're unsure what someone needs, E3 is usually safe.
E5 (around £38 per user per month) adds everything: advanced security and compliance (Advanced Audit, Insider Risk Management, eDiscovery Premium), phone calling through Teams, advanced analytics, Copilot for Microsoft 365 (coming to more organisations through 2026), and priority support. E5 is for your data protection officers, senior leadership, finance teams handling regulated data, and power users who rely on advanced analytics. Most organisations spend too much licensing everyone on E5; real E5 users are typically 5-15% of the workforce.
Real UK pricing in 2026 and cost planning
UK pricing varies slightly by region and channel, but here's what most organisations pay in early 2026:
A typical 100-person UK organisation on a mix (60 E3, 20 E1, 15 Business Standard, 5 E5) runs about £1,800 to £2,200 per month. Many organisations underspend by using Business plans everywhere to save money, then struggle with collaboration and security. Others overspend by licensing everyone on E3 or E5 when a third of them could use Basic or E1.
Mapping job roles to the right licence
Here's where new administrators go wrong: they inherit a licensing model that makes no sense, or they licence based on job title instead of actual usage.
Who needs E5?
Who needs E3?
Who needs Business Standard or E1?
Who needs Business Basic?
Why IT support staff should be licensed correctly (not under-licensed)
New IT administrators often make this mistake: they assume IT support staff should get a basic licence to save money. Wrong. Your IT support team needs E3 minimum, usually with some getting E5. Here's why: IT staff need to troubleshoot complex compliance issues, reset security features, audit user permissions across SharePoint and Teams, and access advanced Defender logs. If your helpdesk is on Business Basic, they'll constantly hit permission walls. You'll spend more time fixing escalations than you save on licensing. Plus, IT staff typically work extended hours and manage sensitive access; they benefit from advanced security features.
Common licensing mistakes and how to avoid them
Mistake 1: Licensing new hires on a guess. Solution: ask their manager what they'll actually do. If unsure, start on E3 (most flexible). You can downgrade later without data loss.
Mistake 2: Never reassessing licences. Solution: quarterly, run a usage report. Look at who logs into Teams daily, who uses desktop Office versus web-only, who accesses advanced features. Downgrade power users who don't need them.
Mistake 3: Using add-on licences inefficiently. Solution: understand that Power BI Pro, Project, Copilot Pro are add-ons to base plans. Don't buy them for everyone. Your finance team might need Power BI Pro; your developers might need Project; but your frontline staff won't.
Mistake 4: Forgetting about inactive users. Solution: audit user accounts quarterly. Inactive users still consume a licence seat and cost you money.
Getting hands-on with Microsoft 365 administration
If you're new to this and want to understand not just licensing but the full picture of M365 administration in practice, the practical skills matter just as much as the theory. Many new administrators come from healthcare or non-IT backgrounds and need structured guidance on how to manage users, permissions, and licence assignments in a real tenant. Try a free 2-hour live session on Microsoft 365 fundamentals through SmoothOps 365, run by practitioners who've managed M365 deployments for NHS organisations and other UK institutions. You'll see the admin portal firsthand and work through a real licensing scenario.
Frequently asked questions
What's the difference between Microsoft 365 and Office 365?
Office 365 is the legacy name for the subscription version of Office (Word, Excel, etc.) plus cloud services. Microsoft 365 is the rebranded product that includes Office, plus Teams, Defender, and device management as a unified package. If you see "Office 365" mentioned, it's likely outdated documentation; use the Microsoft 365 terminology and pricing.
Can I mix Business and Enterprise plans in the same organisation?
Yes, absolutely. You can have some users on Business Premium, others on E3, and a few on E5. Many organisations do this to control costs. The key is making it intentional rather than random. Define roles that fit each tier and assign consistently.
Do I need a separate licence for Teams?
No. Teams is included in all Microsoft 365 Business and Enterprise plans. If you have a user on any modern M365 licence, they have Teams calling and collaboration built in. Standalone Teams Essentials (a free tier) exists but is minimal.
What happens if I run out of licence seats?
Users will be warned that their seat is unlicensed and will lose access to editing and advanced features within 30 days. You'll start seeing errors in your admin reports. Before you hit that point, your Microsoft partner or account manager will flag it. It's not a sudden shutdown, but it's disruptive. Monitor your seat usage monthly.
How often should I review licencing and make changes?
At least quarterly, or whenever you have significant changes (merger, major hiring, reorganisation). A quick monthly review of user counts and inactive accounts keeps you ahead of problems. If you're new to this, quarterly deep dives are enough to start.
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