Why a Microsoft 365 Security Assessment Comes Before Licensing

Which Areas Does a Microsoft 365 Security Assessment Cover?

As a Microsoft Solutions Partner with a Security designation, Sourcepass MCOE consistently sees the highest impact findings surface in the domains below. 

Identity and Access

Identity is the perimeter. Microsoft telemetry shows that over 99% of account compromises involve no malware. Attackers steal credentials and sign in.

A Microsoft 365 security assessment reviews MFA coverage, Conditional Access policy design, legacy authentication exposure, admin role assignment, and sign-in risk activity. MFA on global admins only is not enough, and admin accounts without MFA remain one of the most common findings in first time audits. Every user needs to be enrolled, and Conditional Access is what enforces it. Phishing-resistant MFA has gone from a new feature to a requirement to prevent account compromise. Attacks against features like Device Code Flow are becoming a very common issue. 

Email Security and Authentication

Phishing remains the dominant attack vector for small and mid-sized organizations. Two patterns deserve specific attention.

Self-spoofing through weak DMARC is the first. Phishing mail appears to come from the recipient's own domain because SPF, DKIM, and DMARC were never fully enforced. An assessment validates each record and reports the enforcement mode, not just its presence.

Direct send abuse is the second. Direct send is a legitimate Microsoft 365 feature, enabled by default, that lets internal looking mail bypass several inbound protections. Threat actors are now using it to deliver phishing at volume. Disabling it takes one PowerShell command. Finding it takes an assessment.

The Defender for Office 365 Plan 1 policies (anti-phishing, anti-spam, anti-malware, Safe Links, Safe Attachments) get reviewed here as well. They should be tuned, not left at default. This capability was recently added to multiple bundles including Microsoft 365 E3, but many tenants do not have it configured properly. 

Endpoint Protection

Defender for Business, Defender for Endpoint Plan 1, and Defender for Endpoint Plan 2 cover endpoint security. The right choice depends on what is already deployed and how the environment is managed.

Defender for Business, included in Business Premium, delivers roughly 80-85% of Plan 2 capability. Larger environments and regulated industries more often need Plan 2 for advanced hunting, vulnerability management, and richer incident history. Deployment can run through Intune, Group Policy, scripts, or an RMM tool. A Microsoft 365 security assessment confirms which method is in use and verifies onboarding coverage, which is where most real-world gaps live.

Collaboration and Data Governance

SharePoint and Teams external sharing settings, default OneDrive permissions, and audit log retention all get reviewed here. These settings determine whether an investigation is even possible after an incident.

How Microsoft 365 Security Assessment Findings Drive Licensing Decisions

Once the gaps are documented, each finding falls into one of three buckets.

A tenant on E3 with multiple standalone security add-ons often consolidates into Business Premium (under 300 seats) or Business Premium plus the Defender Suite, frequently at a lower total cost. A tenant already on Business Premium with heavy phishing pressure rarely needs a new license. It needs Defender for Office 365 Plan 1 properly configured and email authentication fully enforced. A tenant facing advanced threats may genuinely need Defender Office 365 Plan 2 capabilities and Entra ID Plan 2 controls that come with Defender suite.

An assessment turns licensing into a decision grounded in evidence.

What Happens After a Microsoft 365 Security Assessment?

An assessment without remediation loses value quickly. Pair it with a hardening engagement that closes the high impact, low effort findings first. Those typically include addressing MFA coverage gaps, baseline Conditional Access, legacy authentication blocking, DMARC enforcement, direct send, audit logging, external sharing defaults, and Defender policy tuning.

More complex controls belong on a roadmap rather than in a sprint. They require business input and testing. Closing the straightforward gaps first delivers more security value than perfecting the harder ones.

When to Run a Microsoft 365 Security Assessment

There is no fixed cadence that fits every environment, but a yearly review is a reasonable floor, with an out of cycle assessment any time the tenant changes shape. If any of the following is true, the next move is an assessment, not a purchase order.

• A renewal is approaching and the license mix has not been reviewed in twelve months
• Phishing volume or sophistication has changed noticeably in the last quarter
• MFA is enabled for admins but not enforced for every user through Conditional Access
• SPF, DKIM, or DMARC have never been validated end to end
• A new Defender SKU or bundle upgrade is already in the technology roadmap

Any one of these is enough to justify an assessment first. 

Why a Microsoft 365 Security Assessment Comes Before Licensing

The right Microsoft 365 license mix is a decision, not a default. An assessment shows what is already owned, what is needed, and what is about to be overspent on. Skipping is not a faster path. It usually leads to higher cost and weaker protection. 

Sourcepass MCOE runs these assessments as a Microsoft Solutions Partner with designations in Modern Work and Security, and a Secure AI Productivity specialization. 

If a renewal is on the horizon or a recent incident is pushing a bigger SKU into the conversation, an assessment is the step that comes first.