How to Reduce Microsoft 365 Security Risk Without New Licences

In this blog post How to Reduce Microsoft 365 Security Risk Without New Licences we will explain how to close common security gaps by configuring the tools your business is already paying for.

Many organisations assume better security requires another Microsoft add-on. Yet the real problem is often much simpler: existing security features were never enabled, policies were left at their defaults, or nobody regularly reviews who can access company information.

Microsoft 365 security works through several connected layers. Microsoft Entra ID controls who can sign in, Exchange Online protects email, SharePoint and OneDrive control file sharing, and Microsoft Defender monitors suspicious activity. Intune, when included in your plan, manages and secures company devices.

If one layer is poorly configured, an attacker may be able to bypass the others. The goal is not to switch on every available feature. It is to identify the settings that reduce the most business risk without disrupting employees or purchasing tools you do not need.

Start by checking what you already own

Before discussing new licences, create an accurate list of your Microsoft 365 plans and the security features included in them. This sounds obvious, but licensing is frequently spread across multiple agreements, resellers and renewal dates.

A business may already have Microsoft 365 Business Premium, Microsoft 365 E3 or another plan containing features that have never been configured. In other cases, premium licences are assigned to employees who do not need them while higher-risk users lack the right protection.

Review licence assignments by role rather than job title. Administrators, finance staff, executives and employees with access to sensitive customer data usually face different risks from occasional or frontline users.

Our guide to reducing unnecessary Microsoft 365 licensing costs explains how small assignment mismatches can create both waste and security gaps.

Use Microsoft Secure Score as a prioritisation tool

Microsoft Secure Score is a dashboard that reviews your Microsoft 365 environment and recommends security improvements. It covers areas such as user identities, administrator permissions, email, applications, data and devices.

Do not treat the score as a target that must reach 100 percent. Some recommendations may not suit how your business operates, and others may require licences you do not own.

Instead, use it to answer three practical questions:

• Which weaknesses could lead to account takeover or data loss?
• Which improvements are already covered by our licences?
• Which changes can we introduce with minimal employee disruption?

Start with actions that protect administrator accounts, enforce multi-factor authentication and close obvious data leakage paths. Record your starting score and review changes monthly so security becomes an ongoing business process rather than a one-off project.

If you have not completed this type of review before, begin with a structured Microsoft 365 security health check.

Strengthen sign-ins before buying more email security

Many Microsoft 365 incidents begin with a stolen password. Once an attacker signs in as a real employee, their activity may initially look legitimate.

Multi-factor authentication, or MFA, requires a second form of proof during sign-in. This could be an approval through an authenticator application, a security key or another verified method. MFA is also one of the Essential Eight, the Australian government’s cybersecurity framework that many organisations use to reduce risk and demonstrate good security practice.

If your organisation uses a basic Microsoft 365 plan, Security Defaults may provide a no-cost way to require MFA and block older sign-in methods that do not support modern security controls. If you already own Microsoft Entra ID Plan 1, Conditional Access can apply more detailed rules based on the user, device, application or sign-in situation.

The important point is to check your current entitlement before assuming Conditional Access requires a new purchase.

Protect administrator accounts separately

Administrator accounts can change settings, access sensitive information and create other accounts. They should never be treated like normal employee accounts.

• Remove administrator access from anyone who no longer needs it.
• Give administrators only the permissions required for their role.
• Use separate accounts for administration and everyday email.
• Require strong MFA for every privileged account.
• Stop sharing administrator usernames between employees or providers.

Restricting administrative privileges is another Essential Eight strategy. It reduces the damage an attacker can cause if an ordinary employee account is compromised.

Close the quiet paths used to remove company data

Security is not only about stopping someone from signing in. You must also control what legitimate accounts, connected applications and external guests can do after access is granted.

Review automatic email forwarding

An attacker who compromises a mailbox may create a hidden rule that forwards invoices, password resets or confidential conversations to an external address. Blocking automatic external forwarding by default can close this path without requiring an additional licence.

Where forwarding is genuinely required, approve it as a documented exception rather than allowing it across the whole organisation.

Tighten SharePoint and OneDrive sharing

SharePoint and OneDrive make collaboration easy, but permissive sharing settings can leave documents accessible long after a project ends. Review anonymous links, guest accounts and sites that allow external sharing.

A practical approach is to allow external sharing only where the business needs it, use links for named recipients instead of anyone with the link, and require site owners to review access regularly.

Control access requested by third-party applications

Employees often connect scheduling tools, document converters and AI applications to their Microsoft accounts. Some request permission to read mailboxes, calendars, contacts or files.

Limit what users can approve without administrator review. This reduces the risk of consent phishing, where a malicious application asks an employee to authorise access instead of stealing their password.

Configure the email protection included with your plan

Exchange Online includes baseline filtering for spam, malware and suspicious outbound email. The problem is that default settings may not reflect your risk, executive roles or business processes.

Review anti-spam and anti-malware policies, spoofing protection, quarantine notifications and alerts for unusual outbound email. If Microsoft Defender for Office 365 is already included in your plan, confirm that its anti-phishing, Safe Links and Safe Attachments features are actually configured.

Buying an advanced email security licence provides little value if the policies remain unused. For a deeper look at this area, see how to reduce phishing risk with Microsoft 365 Defender.

Use your existing device controls

A secure Microsoft 365 account can still be exposed through an unmanaged personal laptop, contractor computer or outdated phone. If your licences already include Microsoft Intune, which manages and secures company devices, make sure devices are actually enrolled and checked for compliance.

Where your existing plan supports it, you can require devices to use encryption, current security updates, screen locks and built-in threat protection before they access sensitive information.

This does not mean blocking every personal device immediately. Start by identifying unmanaged access, protecting high-risk teams and introducing rules in stages. Our article on the hidden risk of unmanaged devices explains why this gap is frequently missed.

A practical scenario

Consider a 180-person professional services firm using a mixture of Microsoft 365 Business Standard and Business Premium. Management believed it needed another security product because phishing attempts were increasing.

A review found that MFA coverage was incomplete, several former IT providers still held administrator access, external email forwarding had not been checked, and Intune licences assigned to key employees were barely being used.

The first stage did not involve purchasing anything. The firm removed old access, separated administrator accounts, completed MFA registration, blocked unnecessary forwarding, tightened file sharing and enrolled high-risk devices.

The business reduced its immediate exposure and gained a clearer view of where additional investment might eventually be justified. Just as importantly, management could see that its existing Microsoft spending was producing more value.

What to do over the next 30 days

1. Confirm your Microsoft 365 plans and existing security entitlements.
2. Review Secure Score and select five high-impact actions covered by current licences.
3. Check MFA coverage, administrator roles and dormant user accounts.
4. Review external forwarding, guest access and public file-sharing links.
5. Confirm that email, audit and device security features are enabled and monitored.

These steps will not complete your Essential Eight journey or remove every cyber risk. They will, however, address several common weaknesses while giving you evidence for future budget decisions.

For organisations wanting a broader program, these actions can feed into a 90-day Microsoft 365 tenant hardening plan.

Better configuration usually comes before more technology

New licences may be justified when your risk, compliance obligations or operating model require more advanced controls. But they should follow a clear assessment, not replace one.

As a Microsoft Partner and Wiz Security Integrator with more than 20 years of enterprise IT experience, CloudProInc helps organisations connect Microsoft 365 settings to practical business outcomes. Our Melbourne-based team works hands-on with clients across Australia and internationally rather than applying a generic security checklist.

If you are not sure whether your current Microsoft 365 setup is leaving gaps or costing more than it should, we are happy to take a practical look — no strings attached.