Last updated: 7 November 2026
Zero Trust is a security approach that never assumes a user, device or network is safe: every request is verified, every user gets only the access they need, and you plan as if a breach has already happened. A small business does not need a big project. It needs MFA, Conditional Access, managed devices and least-privilege access in Microsoft 365.
The three principles
Verify explicitly
Check who is asking, from which device and place, every time.
Least privilege
Give people only the access their job needs, for only as long as needed.
Assume breach
Limit blast radius and monitor so one stolen account cannot reach everything.
Zero Trust in practice for a small business
| Principle | Practical control | Microsoft 365 feature |
|---|---|---|
| Verify explicitly | MFA and risk-based sign-in rules | Entra MFA and Conditional Access |
| Verify the device | Only managed, healthy devices reach data | Intune compliance policies |
| Least privilege | Minimal admin rights and tidy permissions | Roles, groups and SharePoint permissions review |
| Assume breach | Detect and contain quickly | EDR and ITDR monitoring |
Most of this is configuration of tools you may already own. See Conditional Access, Intune and ITDR.
How ABCOM helps
We turn Zero Trust into a short, ordered to-do list for your Microsoft 365 setup, then implement it as part of managed IT. A SharePoint permissions review is a good first step.
Quick answers
Is Zero Trust a product I can buy?
No. It is an approach, delivered through several controls working together. Beware of vendors selling a single “Zero Trust” box.
Want a plain-English Zero Trust checklist for your Microsoft 365 setup?
Related answers and guides
- What is Conditional Access?
- What is Microsoft Intune?
- What is ITDR?
- What is Microsoft Entra?
- All ABCOM FAQs
Sources and further reading
Related questions
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