Microsoft 365 has become the standard productivity platform for businesses across the United Kingdom. From email and document creation to video conferencing and cloud storage, it provides the tools that most businesses rely on every single day. But choosing the right Microsoft 365 plan is not straightforward. Microsoft offers a bewildering array of options — Business Basic, Business Standard, Business Premium, E3, E5, F1, F3, and more — each with different features, limitations, and price points.
Choosing the wrong plan costs your business money. Pay for features you do not use and you waste budget. Choose a plan that is too basic and your team lacks essential tools, leading to workarounds, shadow IT, and security gaps. This guide cuts through the complexity and explains exactly which Microsoft 365 plan is right for your UK business.
The Microsoft 365 Business Plans
For UK SMEs with up to 300 users, Microsoft offers three main business plans. Each includes Exchange Online email with a custom domain, Microsoft Teams for chat and video conferencing, and OneDrive cloud storage. The differences lie in the desktop applications, security features, and advanced capabilities.
Microsoft 365 Business Basic
Business Basic is the entry-level plan and provides web and mobile versions of the Office applications (Word, Excel, PowerPoint, Outlook) along with Exchange Online email, Teams, OneDrive with 1 TB of storage per user, and SharePoint Online. Critically, it does not include the desktop versions of the Office applications — your team can only use Office through a web browser or mobile app.
This plan suits businesses where staff primarily use email, Teams, and basic document editing, and where the web-based versions of Office are sufficient. However, if your team regularly works with complex spreadsheets, lengthy documents, or needs offline access, the web versions will feel limited.
Microsoft 365 Business Standard
Business Standard includes everything in Business Basic plus the full desktop versions of Word, Excel, PowerPoint, Outlook, and OneNote, installable on up to five PCs or Macs per user. It also includes Microsoft Bookings for appointment scheduling and the ability to host webinars in Teams.
This is the most popular plan for UK SMEs and for good reason. The desktop Office applications are significantly more capable than the web versions, and for most knowledge workers, they are essential tools. If your team uses Office applications daily, Business Standard should be your starting point.
Microsoft 365 Business Premium
Business Premium includes everything in Business Standard plus a comprehensive suite of security and device management features: Intune for mobile device management, Azure Information Protection for data classification and encryption, Azure AD Premium P1 for conditional access and multi-factor authentication, and Microsoft Defender for Business for advanced endpoint protection.
For any business that handles sensitive data, is subject to regulatory requirements, or wants enterprise-grade security without enterprise-grade costs, Business Premium is the plan we recommend. The security features alone would cost more than the price difference if purchased separately.
| Feature | Business Basic | Business Standard | Business Premium |
|---|---|---|---|
| Price per user/month (exc. VAT) | £4.60 | £9.40 | £16.60 |
| Web & mobile Office apps | Yes | Yes | Yes |
| Desktop Office apps | No | Yes | Yes |
| Exchange Online email | 50 GB mailbox | 50 GB mailbox | 50 GB mailbox |
| OneDrive storage | 1 TB per user | 1 TB per user | 1 TB per user |
| Microsoft Teams | Yes | Yes | Yes |
| SharePoint Online | Yes | Yes | Yes |
| Intune device management | No | No | Yes |
| Advanced threat protection | No | No | Yes |
| Conditional access | No | No | Yes |
| Max users | 300 | 300 | 300 |
The Enterprise Plans: E3 and E5
For businesses with more than 300 users, or those needing advanced capabilities not available in the Business plans, Microsoft offers Enterprise plans. The two most relevant are E3 and E5.
Microsoft 365 E3
E3 includes the full desktop Office suite, Exchange Online with 100 GB mailboxes (double the Business plans), unlimited OneDrive storage, Azure AD Premium P1, Azure Information Protection P1, and advanced compliance tools including eDiscovery and data loss prevention (DLP). It is the enterprise equivalent of Business Premium but with larger mailboxes, more compliance tools, and no user limit.
Microsoft 365 E5
E5 is the most comprehensive plan, adding advanced security features (Microsoft Defender for Endpoint P2, Cloud App Security), advanced compliance (Advanced eDiscovery, insider risk management), Power BI Pro for business intelligence, and a full cloud phone system. It is a significant investment but provides everything a large organisation needs in a single licence.
Monthly per-user pricing (excluding VAT) as of March 2026
Which Plan Should Your Business Choose?
With so many options, how do you decide? Here is our practical decision framework based on years of helping UK SMEs choose the right plan.
Choose Business Basic If
- Your team mainly uses email and Teams
- Staff rarely need complex Office documents
- Web-based applications are sufficient
- Budget is the primary concern
- You have fewer than 50 users
Avoid Business Basic If
- Staff work with complex Excel spreadsheets
- Offline access to Office apps is needed
- You need advanced formatting in Word/PowerPoint
- Staff are accustomed to desktop Office
- You handle sensitive or regulated data
Choose Business Standard if your team needs the full desktop Office applications for daily work. This is the sweet spot for most UK SMEs with 10 to 200 employees who need professional productivity tools but do not have complex security or compliance requirements.
Choose Business Premium if you handle sensitive data (financial, medical, legal, personal), need to manage company devices, require conditional access policies, or want advanced email threat protection. For any business concerned about cyber security — which should be every business — the security features in Business Premium are genuinely valuable.
Choose E3 or E5 if you have more than 300 users, need advanced compliance tools, require 100 GB mailboxes, or need unlimited OneDrive storage. E5 is justified for organisations that need built-in phone system capabilities, advanced analytics with Power BI, or the highest tier of security and compliance tools.
Mixing Licence Types
One often overlooked strategy is mixing licence types within your organisation. Not every employee needs the same plan. Your finance team might need Business Premium for its security and compliance features, while reception staff might only need Business Basic for email and Teams. Frontline workers might need F1 or F3 licences, which are significantly cheaper.
Microsoft allows you to mix and match plans within the same tenant, so you can optimise your spending by assigning the right licence to each role. A business with 50 users might have 5 on Business Basic, 35 on Business Standard, and 10 on Business Premium — saving hundreds of pounds per month compared to putting everyone on Premium.
One of the biggest hidden costs of Microsoft 365 is unused or underutilised licences. When staff leave, their licences are often left active for months. When trials expire, paid licences kick in automatically. When add-ons are purchased for a project, they remain on the account long after the project ends. Regular licence audits — at least quarterly — are essential to avoid paying for licences nobody is using.
Key Add-Ons to Consider
Beyond the core plans, Microsoft offers a range of add-ons that can enhance your Microsoft 365 environment. The most relevant for UK SMEs include Microsoft Copilot for AI-powered assistance across all Office applications, Microsoft Teams Phone for replacing your traditional phone system, Power BI Pro for advanced business intelligence and reporting, and Visio for flowcharts and diagrams.
Add-ons are charged per user per month on top of your base plan. Before purchasing add-ons, check whether the feature you need is already included in a higher-tier plan — sometimes upgrading the base plan is more cost-effective than adding individual components.
Migration and Setup Considerations
Choosing the right plan is only half the challenge. Migrating your existing email, files, and settings to Microsoft 365 requires careful planning and execution. Common migration scenarios include moving from on-premises Exchange Server, migrating from Google Workspace, transitioning from POP/IMAP email hosting, and consolidating multiple domains.
Each scenario has its own complexities, and a poorly executed migration can result in lost emails, broken calendars, missing contacts, and days of disruption. Professional migration services — such as those offered by managed IT providers — ensure a smooth transition with minimal impact on your team.
Security Configuration Matters
Regardless of which plan you choose, the default security settings in Microsoft 365 are not sufficient for a business environment. At a minimum, you should enable multi-factor authentication for all users, configure email authentication (SPF, DKIM, DMARC) to prevent email spoofing, set up data loss prevention policies for sensitive information, review and restrict external sharing settings in SharePoint and OneDrive, and configure mobile device policies if staff access email on personal phones.
Business Premium and E3/E5 provide the tools to implement these configurations, but they do not configure themselves. Many businesses purchase Premium licences and then never enable the security features they are paying for — arguably the worst possible outcome. If you lack the expertise to configure these settings, work with a managed IT provider who can ensure your Microsoft 365 environment is properly secured.
Need Help Choosing the Right Microsoft 365 Plan?
Cloudswitched is a Microsoft Solutions Partner helping UK businesses select, deploy, and manage Microsoft 365. We handle licence optimisation, migration, security configuration, and ongoing support. Contact us for a free consultation to find the right plan for your business.
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