Common Microsoft Audit Findings — and How to Remediate Them Before They Cost You

Why Microsoft Audit Findings Are Predictable

This predictability is your advantage. Because the findings are foreseeable, they are also preventable. Organisations that conduct proactive internal assessments using the same methodology Microsoft's auditors employ can identify and remediate findings before they generate commercial demands. Our independent Microsoft audit defence team has defended hundreds of audit engagements. We use the same tools and methodology as Microsoft's auditors, but we work exclusively for you. Fixed-fee engagements. Typical outcome: 40 to 60% reduction in the initial demand. For pre-audit support, see our Microsoft audit defence service.

Finding 1: SQL Server Virtualisation Under-Licensing

SQL Server virtualisation is the single largest source of Microsoft audit exposure. The core issue is the disconnect between how virtualisation works technically and how Microsoft requires it to be licensed.

Microsoft requires that SQL Server running on virtualised infrastructure be licensed based on physical cores, not virtual cores. For organisations without Software Assurance (SA) and licence mobility rights, every physical host in a VMware vSphere, Hyper-V, or other non-approved hypervisor cluster that could potentially run an SQL Server VM must be fully licensed.

SQL Server Virtualisation Remediation:

1. Map every SQL Server instance to its physical host. Document which physical servers can run SQL VMs. Include disaster recovery and failover hosts.
2. Verify Software Assurance status. SA with licence mobility is the primary mechanism for avoiding full-host licensing. If SA has lapsed, mobility rights are lost and full physical host licensing applies retroactively.
3. Consider migration to Oracle VM or Microsoft Hyper-V with approved guest licensing for cost-effective compliance.

Finding 2: Unassigned or Unlicensed Microsoft 365 Users

The most administratively straightforward finding: Microsoft 365 licences have not been assigned to users who are actively using Microsoft cloud services. This occurs when users are provisioned in Azure AD but have not been formally assigned a licence, when licences expire and users continue to access services, or when guest users access Teams or SharePoint beyond their permitted use.

Remediation: Run a monthly reconciliation between Azure AD users (including guests) and assigned Microsoft 365 licences. Address gaps before they accumulate. Establish an automated licence assignment workflow for new user provisioning.

Finding 3: Windows Server Edition and Core Count Mismatches

Windows Server licensing requires coverage for all physical cores on a server (minimum 8 cores per processor, 16 cores per server), and the edition must match the virtualisation rights required. Standard Edition permits two virtual machines per licensed server. Datacenter Edition permits unlimited VMs. Under-licensing occurs when organisations run more than two VMs per Standard-licensed server, or when core counts do not cover the physical processor configuration.

Finding 4: Client Access Licence Shortfalls and Multiplexing

Client Access Licences (CALs) are required for every user or device accessing most Microsoft server products (Windows Server, Exchange, SharePoint, SQL Server, Skype for Business). CAL shortfalls occur when the number of users or devices exceeds the licences purchased.

Multiplexing — using hardware or software to reduce the number of users or devices directly accessing a product — does not reduce the CAL requirement. Every end user must be covered by a CAL, even if they access Microsoft services through an intermediary system.

Finding 5: Software Assurance Expiry and Version Rights

Software Assurance provides downgrade rights, version upgrade rights, and licence mobility. When SA expires, these rights are lost — but many organisations do not realise this until an audit reveals they are running software versions they no longer have rights to use (because SA lapsed before the version was released) or have deployed software on infrastructure where licence mobility no longer applies.

Prevention: Maintain a complete SA expiry calendar. Evaluate SA renewal versus alternative licensing paths (subscription, cloud migration) before each SA anniversary. Never allow SA to lapse silently.

Finding 6: Development and Test Environment Misuse

Microsoft provides significantly lower-cost (or free, under MSDN/Visual Studio subscriptions) licences for development and test environments. These licences are strictly limited to development and testing purposes — production use is prohibited.

Dev/Test Remediation Strategy:

1. Inventory every dev/test licence in use and verify each environment is genuinely non-production.
2. Establish a governance process that prevents dev/test environments from being repurposed for production workloads without licence review.
3. Retire MSDN/Visual Studio subscriptions for users who are no longer actively developing on Microsoft platforms.

Finding 7: Microsoft 365 Over-Licensing and Under-Utilisation

While the most visible M365 finding is under-licensing (users without licences), the subtler finding is licence tier mismatch: organisations assigned E5 licences to users who only need E3 or F3 licences. Microsoft audits focus on compliance (under-licensing), but organisations that proactively right-size their M365 estate also eliminate overspend.

Our assessments consistently show that fewer than 20% of users assigned E5 licences actively use E5-exclusive features. Right-sizing a 5,000-seat E5 estate typically yields $200K–$500K in annual savings.

Finding 8: SPLA Compliance Failures for Service Providers

Service providers using Microsoft's Services Provider Licence Agreement (SPLA) to provide hosted services to customers must report actual monthly usage and pay accordingly. SPLA compliance failures occur when reporting is inaccurate, delayed, or when service providers use SPLA licences for their own internal operations (which requires a standard commercial licence, not SPLA).

Finding 9: Hybrid Cloud Licensing Gaps

Hybrid cloud environments — where workloads run across on-premises servers and Azure — create specific licensing complexity. Azure Hybrid Benefit (AHB) allows enterprises to apply on-premises Windows Server and SQL Server licences with SA to Azure VMs, significantly reducing Azure compute costs. The compliance finding occurs when organisations claim AHB without the required SA coverage, or when they count the same on-premises licences for both on-premises and Azure use simultaneously.

Hybrid Cloud Remediation Checklist:

1. Verify SA coverage for every licence claimed under Azure Hybrid Benefit.
2. Ensure licences used for Azure Hybrid Benefit are not simultaneously covering on-premises workloads.
3. Document the licence-to-VM mapping in CSSM and maintain it as Azure workloads change.

Finding 10: True-Up Miscalculations and Reporting Gaps

Enterprise Agreement true-ups require annual reporting of incremental software usage above the original commitment. Under-reporting — whether accidental or deliberate — is the most common EA compliance finding.

True-Up Remediation: Four Steps:

1. Run a full licence inventory 60 days before true-up reporting deadline.
2. Reconcile licence entitlements (original commitment + prior true-ups) against current deployment.
3. Prepare the true-up report with supporting documentation for every incremental quantity.
4. Review the report with independent advisory before submission to identify any discrepancies.

The Pre-Audit Remediation Timeline: 90 Days to Audit Readiness

If you receive an audit notice or want to proactively remediate before an audit, a structured 90-day remediation programme typically addresses the most significant findings:

• Days 1–30: Inventory and assessment. Map all deployments against licence entitlements. Identify finding categories and quantify exposure.
• Days 31–60: Remediation. Address virtualisation gaps, reconcile M365 users, verify SA status, clean up dev/test environments.
• Days 61–90: Verification. Re-run the assessment using Microsoft's methodology. Prepare documentation packages. Brief internal stakeholders.