Microsoft 365 Security Assessment Services: What Businesses Should Expect in 2026

Most businesses running Microsoft 365 believe they are secure. Most of them are wrong.

Microsoft 365 is the most attacked enterprise platform on the planet. With over 400 million paid seats worldwide and 3.7 million companies depending on it for email, file storage, identity management, and collaboration, it is also the platform attackers study most carefully. The default configuration Microsoft ships is designed for convenience, not protection. The gap between being turned on and properly secured is exactly where breaches happen

Microsoft 365 security assessment services are designed to close that gap. In 2026, a professional assessment is not a one-time compliance checkbox. It is a structured evaluation of how well your environment actually protects identities, data, and business continuity — and what needs to change before an attacker finds out the answer first. This guide explains what businesses should expect from a Microsoft 365 security assessment services provider, what it covers, what you should receive when it is done, and how NG Cloud Security delivers it.

What Is a Microsoft 365 Security Assessment?

A Microsoft 365 security assessment is a structured technical review of your Microsoft 365 tenant configuration, identity controls, email security, data protection settings, device management, and monitoring capabilities. It evaluates whether your environment is configured to resist the threats most commonly targeting Microsoft 365 in 2026, and whether the security tools your licenses include are actually being used.

It is not the same as checking your Microsoft Secure Score. Secure Score is a useful indicator, but it measures configuration completeness, not real-world exploitability. A high score can coexist with serious security gaps when controls are enabled but not properly enforced. A proper assessment interprets Secure Score in context and examines the controls that the score does not measure at all.

The assessment acts like a health check for your cloud environment. The goal is to find issues, prioritise them by business risk, quantify exposure, and build a practical remediation roadmap your team can act on immediately.

Microsoft 365 security assessments are relevant for businesses of every size. Smaller organisations are often more exposed than large enterprises because they operate with limited IT resources and assume their default settings are sufficient. Attackers know this. They actively target smaller Microsoft 365 tenants precisely because the barriers to entry are lower.

Why Microsoft 365 Security Assessments Matter More in 2026

The threat environment targeting Microsoft 365 has changed significantly in the past twelve months. Several developments have made regular assessments more urgent than before.

• Attackers are specifically targeting identity. Microsoft’s own Digital Defence Report shows that password attacks against Microsoft identities have increased to over 7,000 attacks per second in 2025. MFA is effective when enforced correctly, but most tenants have bypass paths that assessments routinely discover.

• Microsoft Copilot adoption is accelerating. Over 2 million organisations are now licensed for Microsoft 365 Copilot as of Q1 2026. Copilot accesses email, documents, Teams messages, and SharePoint data. A compromised Copilot session exposes far more than a compromised mailbox. Assessments now include Copilot data access and permission reviews as a standard component.

• Cyber insurance requirements are tightening. Insurance carriers are requiring documented evidence of MFA enforcement, Conditional Access policies, and endpoint security controls as conditions of coverage. Businesses that cannot produce this evidence face higher premiums or denied claims. An assessment produces the documentation insurers need.

• Microsoft licensing is changing. Microsoft announced a pricing increase for Microsoft 365 suites effective July 1, 2026. Organisations that have not assessed their licensing against actual feature usage are often paying for security capabilities they are not using. An assessment identifies both gaps and licensing inefficiencies simultaneously.

• Configuration drift is cumulative. Every new user, every new application, every external sharing permission, and every admin role assignment slightly changes your security posture. Without a formal review, these changes accumulate silently until they represent meaningful exposure.

The average enterprise Microsoft 365 tenant scores between 35% and 50% on Microsoft Secure Score. Organisations in regulated industries should be targeting 75 per cent or higher. The distance between where most tenants are and where they should be is the risk a Microsoft 365 security assessment makes visible.

What a Microsoft 365 Security Assessment Covers

A comprehensive Microsoft 365 security assessment evaluates six core areas. Each area has both configuration components that can be automated and context-dependent judgments that require human expertise to interpret correctly.

Identity and Access Management

Identity is the primary attack surface in Microsoft 365. This section of the assessment examines whether identity controls are configured correctly and whether they are actually being enforced rather than simply enabled.

• MFA enrollment and enforcement status across all users, including administrators, service accounts, shared mailboxes, and guest accounts. MFA enabled but not enforced through Conditional Access leaves bypass paths open.

• Conditional Access policy coverage, logic, and gaps. Assessments commonly find policies that appear comprehensive but contain exclusions or conditions that allow high-risk sign-ins through without challenge.

• Number and configuration of Global Administrator accounts. Microsoft recommends between two and four. Tenants with eight, ten, or fifteen Global Admins are common findings, and each represents a high-value target.

• Privileged Identity Management configuration. Permanent admin role assignments that should be time-limited create unnecessary standing exposure.

• Legacy authentication protocol status. Legacy protocols like POP3, IMAP, and SMTP AUTH bypass MFA entirely and are responsible for the majority of password spray attacks. They should be blocked, but a dependency audit must precede enforcement.

• Guest access and external sharing controls. Overly permissive guest access and anyone-with-the-link sharing permissions are among the most frequent findings in identity reviews.

Email Security

Email remains the number one attack vector targeting Microsoft 365 environments. Business Email Compromise attacks cost organizations more than $2.9 billion globally in 2023 Business Email Compromise attacks cost organizations over 2.9 billion dollars globally in 2023, and the volume has increased since. The email security portion of an assessment evaluates whether Microsoft Defender for Office 365 is configured to provide genuine protection.

• Anti-phishing policy configuration including impersonation protection for key executives and domains.

• Safe Links and Safe Attachments policies. These features detonate suspicious links and files in a sandbox environment before delivery. They provide meaningful protection when configured but are frequently left at default or disabled.

• SPF, DKIM, and DMARC configuration for all sending domains. Missing or misconfigured email authentication records allow attackers to send spoofed emails that appear to come from your domain.

• Quarantine policies and end-user notification settings.

• Mail flow rules that may inadvertently bypass security controls.

Data Protection and Governance

Microsoft 365 contains an organisation’s most sensitive data. The data protection review evaluates whether controls are in place to prevent unauthorised access, accidental exposure, and data exfiltration.

• Microsoft Purview Data Loss Prevention policies for personally identifiable information, financial data, and health records where applicable.

• Sensitivity labels and information protection configuration. Labels enforce encryption and access controls on documents and emails regardless of where they travel.

• External sharing settings for SharePoint, OneDrive, and Teams. Default sharing settings in Microsoft 365 are permissive. Assessments routinely find anonymous sharing links enabled across entire SharePoint environments.

• Retention policies and audit log configuration. Unified audit logging must be enabled and retained for investigations to be possible after an incident.

• Third-party application OAuth permissions. Applications connected to Microsoft 365 through OAuth can access email, files, and calendar data. Many tenants have connected applications that are no longer in use but retain access.

Device Security and Endpoint Management

Devices accessing Microsoft 365 data represent a significant attack surface. This section reviews whether device management and compliance controls are in place.

• Microsoft Intune enrollment status and device compliance policy configuration.

• Conditional Access policies that require device compliance before granting access to corporate resources.

• Microsoft Defender for Endpoint deployment and configuration status.

• Mobile Application Management policies for personally owned devices where full enrollment is not required.

• MDM hardening checks. Recent threat intelligence has identified attackers using MDM platforms to issue remote wipe commands as a destructive attack vector.

Microsoft Secure Score Analysis

Secure Score is reviewed not as the primary metric but as context for understanding configuration completeness. A proper assessment explains why the score is at its current level., identifies which improvement actions deliver the highest security value relative to complexity, and separates score improvements that matter from those that are cosmetic.

The average enterprise should target 75% or higher.. Mid-market businesses typically sit between 35 and 60 per cent. The assessment identifies the highest-impact actions to improve both the score and the underlying security posture it represents.

Compliance and Regulatory Alignment

For organisations operating in regulated industries, the assessment evaluates alignment with relevant frameworks including ISO 27001, NIST CSF, SOC 2, HIPAA, GDPR, and CIS Controls. The compliance review identifies gaps that would represent findings in a formal audit and provides prioritised remediation guidance that supports certification and attestation processes.

Organisations preparing for Microsoft Copilot adoption receive specific guidance on data access governance, sensitivity label coverage, and permission reviews that regulators and auditors are increasingly focused on.

Not Sure How Secure Your Microsoft 365 Environment Really Is?

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What Businesses Should Expect From a Professional Assessment

Not all Microsoft 365 security assessments deliver the same value. A professional assessment service should produce specific, tangible deliverables that your team can act on immediately and that your leadership can use for governance and planning.

Executive Summary

The executive summary translates technical findings into business risk language. It should highlight what could go wrong, what data could be exposed, which changes will reduce risk most efficiently, and what the findings mean for cyber insurance, compliance, and business continuity. It should be readable by a CFO or board member without a technical background.

Detailed Technical Report

The technical report documents every finding with the affected configuration, the risk it represents, the recommended remediation, and the priority level. It includes the Microsoft Defender portal paths, PowerShell commands, or step-by-step instructions needed for your team to implement each recommendation. It should distinguish between findings that are exploitable today and those that represent best practice gaps.

Prioritised Remediation Roadmap

The remediation roadmap organises findings into immediate actions, short-term improvements, and longer-term strategic changes. Immediate actions are the highest-risk findings that should be addressed within days. Short-term improvements are important but less urgent configurations that can be scheduled into normal operations. Strategic changes are architectural improvements that require planning, licensing decisions, or organisational change.

The strongest assessments sequence remediation to address dependencies correctly. Blocking legacy authentication before auditing application dependencies is a common sequencing error that creates service disruptions. A good roadmap accounts for these dependencies explicitly.

Secure Score Baseline and Improvement Plan

The assessment documents your Secure Score at the time of assessment, explains what is driving the current score, and identifies the highest-value improvement actions with their expected score impact. This gives your team a measurable benchmark to track progress over time.

Compliance Gap Analysis

Where relevant to your industry, the assessment includes a gap analysis against the frameworks you are subject to or working toward. This identifies specific controls that are missing or insufficient and provides documentation that supports audit readiness and cyber insurance applications.

How Often Should Businesses Run a Microsoft 365 Security Assessment?

Microsoft updates Microsoft 365 security controls and recommendations quarterly. New features are released continuously. Threat actors adapt their techniques in response. An assessment that was accurate six months ago may not reflect current risk today.

For most businesses, the recommended cadence is:

• An initial comprehensive assessment if your environment has not been formally reviewed in the past twelve months or has never been assessed by an external expert.

• A follow-up assessment three to six months after the initial engagement to validate that remediation actions have been completed correctly and to catch any new gaps introduced during the remediation process.

• An annual comprehensive reassessment as a minimum ongoing cadence, with quarterly Secure Score and Conditional Access policy reviews between full assessments.

• An ad-hoc assessment following significant changes such as a merger or acquisition, a major Microsoft 365 licensing change, the addition of Microsoft Copilot, a security incident, or a change in compliance requirements.

Organisations in regulated industries or those that have experienced a security incident in the past twelve months should consider a six-month assessment cycle.

The Most Common Findings in Microsoft 365 Security Assessments

From assessment experience across businesses of different sizes and industries, the same configuration gaps appear repeatedly. These are not obscure edge cases. They are the misconfigurations that attackers actively exploit.

• MFA enabled but not enforced through Conditional Access. Security Defaults or user-level MFA settings do not close legacy authentication bypass paths.

• Too many Global Administrator accounts. The typical finding is eight to fifteen. Microsoft recommends two to four.

• Legacy authentication protocols still active. Often because a printer, scanner, or line-of-business application was never migrated off Basic Authentication.

• Anonymous sharing links enabled across SharePoint and OneDrive. Any file can be shared with anyone, including unauthenticated external parties, without IT oversight..

• Safe Links and Safe Attachments not configured or applied only to a subset of users.

• DMARC not configured or configured in monitor mode only, allowing spoofed emails to reach recipients.

• Unified audit logging disabled or retention set too short for useful incident investigation.

• Third-party OAuth applications with broad permissions that are no longer actively used by the organization.

• Conditional Access policies that exclude large user populations, devices, or locations for convenience.

• No device compliance policies in Intune or compliance policies that do not require device enrollment.

How NG Cloud Security Delivers Microsoft 365 Security Assessments

NG Cloud Security provides Microsoft 365 security assessment services built for businesses that need clear answers, not technical reports they cannot act on. Our assessments are designed to translate what we find into language your leadership team understands and recommendations your IT team can implement.

Our assessment process covers every area outlined in this guide. We review identity and access management, email security, data protection, device management, Secure Score, and compliance alignment. We examine your Conditional Access policies for gaps and exceptions, your MFA enforcement for bypass paths, your sharing configurations for exposure, and your Defender deployment for coverage gaps.

What you receive from NG Cloud Security includes:

•        An executive summary that frames findings as business risk, not just technical misconfigurations

•        A detailed technical report with specific remediation steps for every finding

•        A prioritised roadmap that sequences changes correctly and accounts for dependencies

•        A Secure Score baseline and improvement plan with expected impact for each action

•        Compliance gap analysis aligned to the frameworks relevant to your industry

•        A debrief session with your IT and leadership teams to walk through findings and answer questions

Following the assessment, NG Cloud Security can implement the recommended changes directly or support your internal team through implementation. We provide ongoing managed SOC services for organisations that want continuous monitoring and expert oversight after remediation is complete.

Organisations that work with NG Cloud Security come away with a clear, honest picture of where their Microsoft 365 environment stands today and a practical plan to make it stronger. Whether you are preparing for a compliance audit, responding to an insurance requirement, planning to deploy Microsoft Copilot, or simply overdue for an honest review of your security posture, our assessment gives you the information you need to act with confidence.

Benefits of a Professional Microsoft 365 Security Assessment

Organisations that invest in a professional Microsoft 365 security assessment typically see measurable improvements across several areas.

• Reduced risk of account compromise and data breach through closed identity and email security gaps

• Stronger cyber insurance position with documented evidence of security controls

• Improved compliance readiness for ISO 27001, SOC 2, HIPAA, GDPR, and CIS Controls

• Better return on Microsoft 365 licensing investment as underused security features are identified and activated

• A defensible security baseline that demonstrates due diligence to leadership, insurers, and regulators

• Faster and safer Microsoft Copilot adoption with data access governance in place before deployment

• Reduced likelihood of costly security incidents that disrupt operations and damage customer trust

Frequently Asked Questions

What does a Microsoft 365 security assessment include?

A comprehensive Microsoft 365 security assessment includes a review of identity and access management, email security configuration, data protection and governance settings, device management and endpoint security, Microsoft Secure Score analysis, and compliance framework alignment. It examines whether your environment is configured correctly across each of these areas, identifies misconfigurations and gaps that create risk, and produces a prioritised remediation roadmap. Professional assessments also produce an executive summary that translates technical findings into business risk language suitable for leadership and board reporting.

How long does a Microsoft 365 security assessment take?

A comprehensive enterprise Microsoft 365 security assessment typically takes two to three weeks from kickoff to final report delivery. The initial data collection and automated scanning phase takes one to two days. Expert analysis, contextualization, and report preparation take the majority of the engagement. For smaller businesses with simpler environments, a focused assessment can be completed in five to seven business days. The timeline depends on the size of the tenant, the complexity of the environment, and the depth of compliance review required. NG Cloud Security provides estimated timelines during the initial consultation based on your specific environment.

How much does a Microsoft 365 security assessment cost?

The cost of a Microsoft 365 security assessment varies based on the size of the organisation, the scope of the review, the level of compliance analysis required, and whether remediation support is included. Basic assessments for smaller businesses typically range from a few hundred to a few thousand dollars. Comprehensive enterprise assessments with full compliance gap analysis and remediation support range higher. Some providers, including NG Cloud Security, offer a free initial assessment or consultation to determine the scope before providing a quote. The cost of an assessment is typically a fraction of the cost of a single security incident, which averages over 4 million dollars for a data breach according to IBM research.

What is Microsoft Secure Score and how is it used in an assessment?

Microsoft Secure Score is a measurement tool in the Microsoft Defender portal that evaluates your Microsoft 365 configuration against Microsoft’s recommended best practices and assigns a percentage score. A higher score indicates more recommended controls are in place. The average enterprise score is between 35 and 50 per cent. Organisations in regulated industries should target 75 percent or higher. In a professional assessment, Secure Score is used as a starting point and a benchmark, not as the primary measure of security. A good assessment explains what is driving the current score, identifies the highest-impact improvement actions, and distinguishes between score improvements that represent real risk reduction and those that are cosmetic.

How often should a Microsoft 365 security assessment be performed?

For most businesses, a comprehensive Microsoft 365 security assessment should be performed at least annually. A follow-up assessment three to six months after the initial engagement validates that remediation was completed correctly. Quarterly reviews of Conditional Access policies and Secure Score should happen between full assessments. Additional assessments should be triggered by significant changes such as a merger or acquisition, a major licensing change, deployment of Microsoft Copilot, a security incident, or new compliance requirements. Organisations in regulated industries benefit from a six-month full assessment cycle.

Can a Microsoft 365 security assessment help with cyber insurance requirements?

Yes. Cyber insurance carriers in 2026 increasingly require documented evidence of specific security controls as conditions of coverage or as factors in premium calculation. These commonly include MFA enforcement, Conditional Access policies, endpoint detection and response, email security controls, and data backup. A professional Microsoft 365 security assessment produces documentation of which controls are in place, which gaps exist, and what the remediation plan is. This documentation supports insurance applications, renewal conversations, and claims processes. Organisations that can demonstrate a formal assessment and an active remediation program typically receive more favourable terms than those with no documented security review.

Final Thoughts

Microsoft 365 is where your business operates. It holds your email, your documents, your identity system, and increasingly your AI-powered productivity tools. Attackers know this. They invest significant effort in understanding Microsoft 365 default configurations and the gaps that most organisations never close.

A professional Microsoft 365 security assessment engagement gives you an honest, expert-led view of where your environment actually stands. Not where you assume it stands. Not what your Secure Score suggests. Where it actually is, relative to the threats targeting it today.

The businesses that invest in regular assessments are the ones that avoid the incidents their peers experience. They close gaps before they become breach pathways. They satisfy insurers and auditors with documented evidence. They deploy new capabilities like Microsoft Copilot with confidence rather than risk.

If your Microsoft 365 environment has not been formally assessed in the past twelve months, now is the right time.

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