Microsoft 365 for Small Businesses: A Complete Guide

Microsoft 365 (formerly Office 365) is the cloud platform that most businesses end up using at some point. If you are considering it, have just signed up, or have been using it for years without getting the most from it, this guide covers everything you need to know.

What Is Microsoft 365?

Microsoft 365 is a subscription service that bundles together cloud-hosted email (Exchange Online), Office applications (Word, Excel, PowerPoint, Outlook), file storage (OneDrive and SharePoint), and collaboration tools (Teams), plus security and compliance tools depending on the plan.

The key difference from traditional Office is that it is a subscription (typically monthly or annual per user) rather than a one-time purchase, and it runs from the cloud, meaning you always have the latest version.

Which Plan Should You Choose?

Microsoft offers three main plans for small businesses:

Microsoft 365 Business Basic (£4.90/user/month)

• Exchange Online email with your own domain
• Web-only versions of Office apps
• Teams, SharePoint, and OneDrive
• Good for: businesses whose staff mainly work in a browser, or as email-only for some users

Microsoft 365 Business Standard (£10.30/user/month)

• Everything in Basic, plus
• Full desktop apps (Word, Excel, PowerPoint, etc.) on up to 5 devices
• Good for: most small businesses — this is the most popular plan

Microsoft 365 Business Premium (£18.60/user/month)

• Everything in Standard, plus
• Advanced security including Microsoft Defender for Business
• Intune device management
• Azure AD Premium P1
• Good for: businesses with higher security requirements or cyber insurance obligations

Key Features You Should Be Using

Exchange Online

Professional email on your own domain (@yourcompany.co.uk) with 50GB mailbox per user, shared calendars, and global address book.

Microsoft Teams

Not just video calls — Teams is a complete collaboration platform with channels for projects, file sharing, and internal chat. If your team is not using it this way, you are leaving significant value on the table.

SharePoint and OneDrive

SharePoint is for shared company files; OneDrive is for individual files. Both sync to your computer so you can work offline and have a copy on your device. Both also version your files, so you can recover accidentally deleted or overwritten documents.

Microsoft Defender (Business Premium only)

Enterprise-grade endpoint protection included with Business Premium, replacing the need for a separate antivirus subscription.

Common Mistakes to Avoid

Not using MFA: Enable multi-factor authentication from day one. It is the single biggest security improvement you can make.

Not backing up Microsoft 365: Microsoft's retention features are not a backup. A ransomware attack or misconfiguration can permanently delete data. Use a dedicated Microsoft 365 backup solution.

Paying for unused licences: Review licences regularly and remove users who have left the business. Also check whether all users actually need a premium plan.

Not using Teams properly: Many businesses pay for Teams and only use it for video calls. Get training on channels, tabs, and file sharing to get full value.

If you would like help setting up or getting more from your Microsoft 365 subscription in the Colchester area, call us on 01206 688598.