How to Strengthen Your Cyber Defences in 2026

1. Accept That Email and Identities Are Your Primary Attack Surface

UK government research consistently shows that phishing remains the most common and disruptive cyber attack against UK businesses, with SMEs heavily affected. In Microsoft 365 environments, attackers typically aim to:

• Steal login credentials
• Bypass weak authentication
• Use compromised mailboxes for fraud or data theft

That makes identity security and email protection your top priorities.

2. Enforce Strong Authentication Across Microsoft 365

Passwords alone are no longer sufficient. Every Microsoft 365 tenant should have multi-factor authentication (MFA) enabled as a baseline.

What good looks like in 2026:

• MFA enforced for all users, not just admins
• Separate admin accounts for IT management
• Conditional Access policies limiting logins by risk, device, or location
• Movement toward phishing-resistant MFA (such as passkeys or FIDO2 where supported)

The UK’s National Cyber Security Centre (NCSC) explicitly recommends MFA for corporate online services, particularly email and cloud platforms.

If you outsource managed IT support, ensure they:

• Cannot bypass MFA
• Use their own named admin accounts
• Log and monitor privileged access

3. Harden Microsoft 365 Email Against Phishing

Because email is the number one entry point, Microsoft 365 email security should be actively managed—not left on default settings.

Essential controls:

• SPF, DKIM and DMARC configured correctly for your domain
• Microsoft Defender for Office 365 (or equivalent) policies tuned for:
  • Safe Links
  • Safe Attachments
  • Anti-phishing protection

DMARC is especially important: it prevents criminals from impersonating your domain to scam customers, suppliers, or staff—an increasingly common tactic against UK SMEs.

The NCSC provides clear, step-by-step guidance for implementing email anti-spoofing controls.

4. Secure Endpoints Through Managed IT

In modern Microsoft 365 environments, laptops and mobile devices are effectively the “new perimeter”.

Your managed IT provider should ensure:

• Full-disk encryption on all laptops and mobile devices
• Centralised patching for operating systems and applications
• Removal of local admin rights for standard users
• Endpoint protection aligned with Microsoft Defender or equivalent

Lost or stolen devices are still a major data risk. Encryption and device management ensure that a physical loss does not become a reportable data breach.

5. Backups: Protect Data Beyond Microsoft 365 Defaults

Microsoft 365 provides resilience—but it is not a full backup solution. Accidental deletion, malicious activity, or ransomware can still result in data loss.

Best practice for UK SMEs:

• Independent backups of Microsoft 365 data (Exchange, OneDrive, SharePoint, Teams)
• At least one isolated or off-site copy
• Regular restore testing

The ICO (Information Commissioner’s Office) makes clear that organisations must ensure the availability of personal data and the ability to restore it promptly—backups are central to this requirement.

6. Use Cyber Essentials as Your Managed IT Baseline

Cyber Essentials remains the UK’s most relevant baseline security standard for SMEs.

A capable managed IT provider should:

• Align their service with Cyber Essentials requirements
• Actively manage patching, firewalls, malware protection and access control
• Support certification if required (or at least follow the controls)

Cyber Essentials focuses on defending against common, real-world attacks—exactly the threats most SMEs face.

7. Control Access to Microsoft 365 Data

Over-permissioned users are a silent risk.

In 2026, best practice includes:

• Role-based access control
• Regular access reviews (especially for leavers and role changes)
• Tight controls on SharePoint and Teams sharing
• External sharing enabled only where genuinely needed

This aligns with UK GDPR expectations around limiting access to personal data to those who genuinely need it.

8. Hold Your Managed IT Provider to Security Standards

Managed IT reduces risk only if the provider follows strong security practices themselves.

You should expect your provider to:

• Use MFA on all access to your systems
• Have incident response procedures
• Provide audit logs and reporting
• Notify you promptly of security incidents
• Support compliance with UK GDPR and Cyber Essentials

Your supply chain is part of your cyber risk profile, this is increasingly recognised by regulators and insurers.

9. Prepare a Simple Incident Response Plan

Even well-protected Microsoft 365 tenants can experience incidents. What matters is how quickly and calmly you respond.

Your plan should cover:

• Who contacts your managed IT provider
• How compromised accounts are disabled
• When banks, insurers, or customers are notified
• How incidents are reported to UK authorities if required

The NCSC provides a national reporting route for significant cyber incidents, while UK fraud reporting services handle cyber-enabled fraud.

What This Means for UK SMEs in 2026

With Microsoft 365 and managed IT, most SMEs already own the tools they need. The challenge is configuration, enforcement, and accountability.

The strongest next steps:

1. Enforce MFA & review admin access

2. Lock down Microsoft 365 email & identities

3. Verify backups & recovery regularly

4. Align IT services with Cyber Essentials

5. Keep software & devices patched

6. Train staff on phishing & safe practices

7. Have a simple incident response plan