Microsoft runs the widest-reaching license-audit operation in enterprise software, working through Software Asset Management (SAM) engagements, partner-led self-verifications, formal audits, and Services Provider License Agreement (SPLA) reviews. This hub explains how a Microsoft audit works, what gets measured, and lists independent firms that defend buyers, each with balanced pros and cons.
Microsoft reaches more customers than any other publisher, and it does so through several channels that all lead to the same place: a true-up invoice.
Microsoft rarely opens with the word audit. The most common entry point is a Software Asset Management (SAM) engagement or a self-verification, offered through a Microsoft account team or an authorized partner and framed as a free optimization review. A formal audit, invoked under the audit clause in the Microsoft Business and Services Agreement or the volume licensing agreement, is usually run by an appointed third party such as Deloitte, KPMG, or EY. Hosting providers face a separate track: SPLA reviews of monthly usage reporting.
What is changing in 2026 is the resolution path. Microsoft increasingly settles a compliance gap not with a cash penalty but with a forward cloud commitment, converting an exposure into an Azure consumption commitment, a Microsoft 365 E5 step-up, or a larger enterprise agreement. That can be a reasonable outcome, but it is a commercial negotiation, and the findings that set its size are frequently contestable.
Audit pressure is near a historic high. Industry surveys in 2024 and 2025 found that 62 to 63 percent of organizations were subjected to a software audit within a 12 month period, and that 52 percent of audited organizations now bring in outside defense help rather than negotiating alone. The escalation leaders are consistent: Microsoft, IBM, SAP, Oracle Java, Red Hat, and Broadcom VMware. Gartner predicted in 2023 that by 2026 more than one in five organizations running Oracle Java would face an Oracle audit. The pattern across vendors is the same: a licensing metric the buyer cannot easily self-measure, a data request framed as routine, and a remediation quote that arrives larger than the real exposure.
Recognize them early and you keep leverage. Each tactic is factual and not a criticism of Microsoft, which is entitled to enforce its agreements.
A SAM engagement or self-verification is offered as help. It is the data-gathering phase of a compliance process. What you report can become the baseline for a true-up.
You are asked to run discovery tooling and return deployment data for Microsoft 365, Windows Server, and SQL Server. Scope the request before any data leaves your network.
SQL Server and Windows Server are licensed per physical core with minimums. Virtualization, failover, and disaster-recovery rights are where most disputed findings arise.
User and device CALs for Windows Server, Exchange, and SharePoint are easy to under-count, and easy for an auditor to inflate. External-user and multiplexing assumptions matter.
Assigned licenses, security add-ons, and shared mailboxes are reconciled against actual usage. Over-assignment and mixed E3 and E5 estates produce both gaps and reclaim opportunities.
Service providers report usage monthly. Under-reporting, unlicensed mobility, and shared-hardware assumptions are the recurring SPLA findings.
Exposure concentrates in a handful of products. Knowing which ones drive your risk tells you where to prepare.
The estate that generates most Microsoft findings is predictable: SQL Server (per-core, with Software Assurance mobility and high-availability rights), Windows Server (per-core, plus CALs), Microsoft 365 and Office 365 (E3 and E5 assignment versus usage, security and compliance add-ons), Windows 11 Enterprise, and the management stack (Configuration Manager, Intune). Dynamics 365 and the Power Platform are rising sources of findings as usage-based and per-app licensing spreads. For service providers, SPLA reporting is its own discipline. The common thread is metrics the buyer cannot easily self-measure: cores behind a hypervisor, CALs for external users, and license assignment that drifts as headcount and roles change.
Azure Hybrid Benefit and bring-your-own-license rights reduce cost when applied correctly and create exposure when applied wrongly, so they are a frequent focus of both findings and legitimate reclaims.
Most Microsoft findings cluster into a few categories. Each has a defensible counter-position and a legitimate reclaim hiding nearby.
The recurring findings are under-counted SQL Server cores behind virtualization, Windows Server core minimums and missing CALs, Microsoft 365 license assignment that has drifted above usage, security add-ons applied unevenly across an E3 and E5 estate, and SPLA under-reporting for hosters. The preparation that changes outcomes is the same in every case: establish your own measured baseline before the vendor does, reconcile assigned licenses against actual usage, and document virtualization, failover, and disaster-recovery configurations precisely, because these are where auditor assumptions inflate the number.
Remediation is increasingly a forward commitment rather than a back-penalty: an Azure consumption commitment, a Microsoft 365 step-up, or a restructured enterprise agreement. That can be a sound outcome, but it should follow, not precede, contesting the findings on their technical merits. A common and legitimate by-product of preparation is the reclaim: over-assigned Microsoft 365 licenses and lapsed Software Assurance benefits often mean the buyer is also over-paying, and a defense engagement frequently surfaces savings alongside the disputed exposure. None of this is a criticism of Microsoft, which is entitled to enforce its agreements; it is a description of where the measurement is contestable.
Audit posture, contract law, and data-handover rules differ by market. Pick yours for the firms serving it and the local guidance.
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The firms above are listed in neutral alphabetical order, not ranked. The site does not score firms, number them, or tell you which to choose. Each entry carries a short, balanced set of pros and cons so you can weigh them yourself.
Independence is shown as a factual pro: a buyer-side firm with no vendor partnership, no reseller relationship, and no commission has no incentive to sell you more licenses. A reseller relationship is shown as a factual con, because a firm that also resells the vendor's licenses carries a potential conflict of interest with buyer-side audit defense. Neither is a verdict. Both are trade-offs for you to weigh against the firm's depth, jurisdiction, and track record.
Listed alphabetically with pros and cons. A directory, not a ranking.
North American mid-market specialist. Pragmatic, fast engagements for Microsoft and Autodesk named-user reconciliations.
Infrastructure-licensing focus. Built a Broadcom/VMware transition practice modeling core-count and subscription-conversion exposure.
Founded by two ex-Oracle LMS auditors. Reverse-engineers the publisher's own measurement scripts to contest inflated findings before they harden into a claim.
European SAM specialists. Heavy on Microsoft enterprise agreements and SAP indirect-access defense across EU jurisdictions.
Tokyo-based APAC practice. Bilingual negotiation and localization of global audit positions for Japanese and pan-Asian entities.
Independent enterprise software licensing advisory with a deep Oracle and Java audit-defense practice. No vendor partnership, no reseller relationship, and no commission, with engagements focused on Java SE audit defense, ULA exits, and renewal resets.
Full-spectrum audit response shop. Strong on Oracle Java SE per-employee defense and Salesforce org-sprawl true-ups.
Sydney-based, APAC-wide. Known for de-escalating publisher contact and resetting the audit clock in the client's favor.
Listed alphabetically, not ranked. This is a directory, not a ranking. Last reviewed: June 2026.
Direct answers to the questions buyers ask most about this page.
No, but treat it with the same care. A SAM engagement or self-verification is not the formal audit invoked under your agreement, yet the deployment data you provide can set the baseline for a true-up. The data you share is hard to walk back, so scope the request and validate the numbers before returning anything.
Microsoft typically appoints an independent third party such as Deloitte, KPMG, or EY to run a formal audit under the audit clause in your Business and Services Agreement or volume licensing agreement. The auditor reports to Microsoft, which then negotiates resolution. SPLA reporting reviews for hosting providers follow a separate process.
In 2026 Microsoft increasingly resolves a compliance gap with a forward commitment, such as an Azure consumption commitment or a Microsoft 365 E5 step-up, rather than a cash penalty. This can be a workable outcome, but the underlying findings are a negotiation, and the commitment is sized by figures you can contest.
No. This is a directory, not a ranking. Firms are listed in neutral alphabetical order with balanced pros and cons, and the site recommends no one. Independence is shown as a factual pro and a reseller relationship as a factual con, both as trade-offs for you to weigh.
Yes. The directory and the matching service are free for buyers. License Audit Defenders is not a law firm and takes no money from software publishers.
Tell us your situation and we route your brief to firms that cover Microsoft in your jurisdiction.
The directory and the matching service are free for buyers. We are not a law firm and take no money from software publishers. Confidential: no vendor sees your brief.