A Microsoft audit defense service is independent, buyer-side representation that runs your Microsoft compliance review and shrinks the claim. A SAM engagement, a formal audit, or a SPLA reconciliation can each produce a seven-figure bill if you respond unprepared. We manage the process end to end, control what data Microsoft sees, challenge inflated findings, and turn a compliance event into a controlled commercial negotiation.
Last reviewed 6 June 2026 by the Atonement Licensing Microsoft practice.
Microsoft does not run audits the way Oracle LMS does, but a Software Asset Management engagement or a partner-led deployment review carries the same financial risk. The opening position is built from the broadest reading of your deployment, and the burden of disproving it falls on you.
We act as the buffer between you and the reviewer, set the scope in writing, and rebuild the effective licence position from evidence before any number is accepted. Where the review sits alongside a renewal, we keep the two separate and run the commercial deal through our buyer-side Microsoft negotiation support.
Get confidential Microsoft audit defenseScope control, independent measurement, and settlement negotiation, with EA and SPLA covered.
Common triggers include rapid growth or merger and acquisition activity, large drops in licence spend, lapsed Software Assurance, hosting under SPLA, an Enterprise Agreement renewal, and simply being overdue for a review. Microsoft uses both direct audits and softer SAM engagements run through partners. Both can lead to a compliance claim, so both deserve a defended response. Cloud migration is a frequent trigger because it disturbs Windows Server and SQL Server positions.
We act as the buffer between you and the reviewer. We agree the scope and data-collection method in writing, validate every tooling output before it is shared, and reconcile deployment against entitlements ourselves. We then contest mismeasurement, because virtualised cores, dev and test rights, bring-your-own-licence and licence mobility are frequent sources of overstated findings. Once the real position is established, we fold any genuine gap into a commercial negotiation, usually settled through a forward purchase rather than back-dated penalties.
SPLA hosters carry extra exposure because licences are self-reported monthly under the Services Provider Use Rights. SPLA audits frequently challenge subscriber access licence versus core counting, listed versus unlisted products, and end-customer reporting. We reconstruct your reporting position, fix the methodology, and defend the historical numbers.
A controlled, four-stage engagement that keeps you in command of scope, data, and the commercial outcome.
We read the notification, your agreement, and the Product Terms verification clause before you reply. We define what data Microsoft is entitled to request and what it is not, so the review starts narrow rather than open-ended. Nothing leaves your control until the scope is agreed in writing.
We validate the SAM tooling output, which overstates deployment when it reads installed binaries rather than active use. We rebuild the effective licence position ourselves across SQL Server, Windows Server, client access licences, and Microsoft 365, separating real usage from dormant accounts and pre-migration core counts.
We contest every overstated line on contract, Product Terms, and technical grounds. SQL Server virtualisation, Windows Server core gaps after cloud migration, and dormant Microsoft 365 accounts are the highest-value findings, and each is contestable with the right evidence.
We settle any genuine shortfall on your terms, structured as a forward purchase rather than a back-charge, and timed to your calendar. Where useful, we fold the resolution into a wider Microsoft deal through our Microsoft contract negotiation service.
Microsoft rarely opens with a hard legal audit. The usual route is a Software Asset Management engagement or a partner-led deployment review, presented as cooperative and advisory. The reviewer collects deployment data, runs it through SAM tooling, and builds an effective licence position against your entitlements. Any gap is then converted into a purchase demand. Despite the friendly framing, the financial risk matches a formal audit, and the opening position is built from the broadest reading of your estate.
Microsoft's right to verify compliance sits in the agreement and the Product Terms, which allow a review with reasonable notice, generally using an independent auditor or a SAM partner. The burden of disproving the claim falls on you, which is why the order and scope of disclosure matter as much as the underlying facts. The data you hand over defines the claim. Engaging independent support before you respond to the first request is the single highest-return decision in the process. For the cluster context, read our analysis of Microsoft Purview audit licensing.
A Microsoft license audit moves through predictable stages: notification, data collection, an effective licence position drafted by the reviewer, negotiation, and settlement. The number is set in the data-collection and findings phase, so the earlier independent representation is involved, the more of the claim can be challenged before anything is accepted.
The most expensive findings cluster in a few places. SQL Server licensed by virtual core on infrastructure that does not qualify produces full physical-host claims across a cluster. Windows Server core counts drift out of line after cloud migration and re-platforming. Microsoft 365 accounts get counted as active when they are disabled, service, or departed-employee accounts. Client access licences for Windows Server, Exchange, and SharePoint are among the most error-prone areas of any audit. Each is reducible with configuration data, directory records, and the correct reading of the Product Terms. Across our work, independent representation cuts the audit claim by 72% on average. For deeper background, read our guide to the Microsoft audit defense service in practice.
Request a confidential audit reviewContinue across our Microsoft advisory practice and research.
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