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The single most important moment in any Microsoft audit is the 14 days following the notification letter. The buyer's posture in those 14 days — what data is acknowledged, what scope is conceded, what timeline is agreed — shapes 70-85% of the eventual finding stack. The reason most enterprise buyers lose Microsoft audits is not that they were under-licensed. It is that the licensing team responded to the notification before anyone with audit defense experience read the letter.
Microsoft Verification letter
The current name for what used to be called a SAM engagement. Comes from Microsoft Licensing Compliance citing the contractual audit clause in your EA, MPSA or MCA. Names a Big Four or specialist licensing auditor as verification partner.
SAM engagement letter
The legacy form — sometimes still used in EMEA. Functionally identical to a Verification. Same posture required.
True-up dispute or restatement
Microsoft has flagged a prior True-Up filing as under-reported, opened a restatement request, or applied retroactive pricing on the disputed estate.
SPLA audit
Service Provider Licensing Agreement audit — common for hosting providers, MSPs, telcos. Reports-as-filed methodology, but Microsoft can dispute the methodology.
Unified Support overlap dispute
Microsoft Premier or Unified Support has flagged a licensing exposure during a support engagement and escalated to Licensing Compliance.
Surprise renewal-side compliance gating
Microsoft account team has linked your EA renewal commercial proposal to a compliance settlement — a tactic Microsoft uses to force concession.
Reseller (LSP) compliance escalation
Your Licensing Solution Provider has flagged compliance gaps and offered to "represent" you to Microsoft Compliance — they cannot represent you, they are conflicted.
Internal whistleblower or M&A trigger
Pre-M&A diligence, internal audit finding, or whistleblower flag has surfaced licensing exposure ahead of a Microsoft outreach.
How audit defense engagements work
The first phone call is 30 minutes. The audit defense partner who would lead your engagement is on the call personally — no junior associate triage, no business-development screen. We review the notification letter, the contractual instrument, the named auditor, the buyer's current EA / MPSA / MCA position, and the buyer's internal data posture. We tell you, on that first call, whether the audit can be defended at the notification stage, whether it needs to be scoped down before any data is handed over, and whether there is a renewal-side concurrency the account team is exploiting.
Within 24 hours: audit posture review
Confidential review of the notification letter, the contractual audit clause in your EA / MPSA / MCA, the named verification partner, and the buyer-side exposure profile. Written posture memo within 48 hours.
Within 5 business days: fixed-fee engagement letter
Scoped engagement letter signed by the firm's Managing Partner and the named audit defense practice lead. Fixed-fee, named-partner accountability, no contingency, no success fee. No Microsoft Partner Network rebates, no LSP referrals.
Scoping phase: bound the audit
Negotiate the scope (which entities, which products, which time period), the methodology (which audit framework the verification partner will use), the data hand-over format, the timeline, and the privilege posture. Most defensible buyer-side wins are bought here, before any data leaves the building.
Data and analysis phase: discipline the methodology
Validate the data Microsoft and the auditor are using. Dispute methodology choices that favor the auditor (qualified user vs device math, SA coverage interpretation, dual-use rights treatment, SCCM vs SCOM extract methodology, Azure subscription mapping, dev/test exclusions).
Finding-stack negotiation: defend item by item
Counter the finding stack item by item. Apply available product use rights, SA benefits, downgrade rights, MSDN / Visual Studio coverage, Azure Hybrid Benefit and EA grace periods that the auditor has systematically not applied.
Settlement design: structure the close
Convert the residual finding stack into a settlement structure that matches your EA renewal commercial position — not a standalone cash payment to Microsoft Compliance. We structure settlements as future-licensing credits, EA term commitments and Azure consumption commitments where doing so produces materially better economics for the buyer.
Global manufacturing buyer · 24,000 EA seats · Microsoft Verification opened concurrently with EA renewal. Microsoft Licensing Compliance opened a Verification citing a Big Four firm as verification partner. Opening finding stack at scoping close: $4.7M across Windows Server data-center licensing, SQL Server core licensing on virtualized hosts, and M365 E5 over-deployment in non-licensed regions. Concurrent EA renewal proposal: $54M over 3 years, with the account team explicitly linking compliance settlement to renewal commercial terms. Audit defense engagement opened day three after notification. Outcome: Verification finding closed at $610K (87.0% reduction off opening stack) after methodology disputes on the virtualized host count and AHB applicability, applied as a future-licensing credit against the renewal. EA renewal closed at $37.4M (30.7% reduction). The buyer's licensing team had never been through a Microsoft Verification before. The first call to our audit defense practice was the single most expensive 30 minutes Microsoft did not get in 2025.
Brief the audit defense partner on call
Confidential audit defense briefing
30-minute call with the audit defense partner who would lead the engagement. Same-day response Monday–Friday US Eastern. Confidential. No business-development screen.
Why independent audit defense — and not your LSP or Big Four firm
The Microsoft audit defense market is structurally conflicted everywhere except buyer-side independent advisors. Your Licensing Solution Provider (LSP) cannot represent you against Microsoft Compliance — the LSP earns Microsoft Partner Network rebates and channel incentives that pay out when the buyer licenses more, not less. The Big Four firm conducting the verification is contractually retained by Microsoft, not by the buyer. Microsoft's own account team is on the commercial side of the same negotiation. Outside legal counsel can manage the privilege posture but typically lacks Microsoft licensing fluency at SKU level.
Independent buyer-side audit defense is the only category in this market that has no Microsoft revenue exposure, no Microsoft Partner Network rebate, no LSP referral fee, and no incentive structure that pays out on the buyer licensing more. The advisor's only compensation is the buyer's fixed retainer. That is the structural reason independent audit defense produces materially better outcomes than any of the conflicted alternatives. The independent advisor vs LSP comparison walks through this in detail, and the independent vs Microsoft-aligned advisor comparison covers the partner-network and rebate dynamics.
Frequently asked questions
What is a Microsoft Verification engagement?
The current name for Microsoft's customer compliance review — the successor to the SAM (Software Asset Management) engagement. It opens with a notification letter from Microsoft Licensing Compliance citing the contractual audit clause in your Volume Licensing Agreement. Microsoft typically appoints a Big Four firm or specialist licensing auditor as the named verification partner. You are contractually obligated to respond, but the timeline, scope, methodology, and form of the response are all negotiable.
Can we refuse a Microsoft audit?
Not outright — every EA, MPSA and MCA contains a contractual audit clause. But you can negotiate the scope, methodology, named auditor, timeline, and data hand-over format. You can reject auditor positions on individual SKUs, dispute the methodology, and counter the finding stack item by item. Most buyers do not exercise these rights because their licensing team has never been through a Microsoft audit before. That is the gap an independent audit defense advisor fills.
How long do Microsoft audits take?
Typically 6-14 months from notification letter to settlement. Scoping runs 30-60 days, data collection and analysis 90-180 days, finding-stack dispute resolution 60-120 days, settlement structuring 30-60 days. Engagements with an independent advisor from notification close 30-40% faster and at 60-85% lower finding-stack values than mid-audit-engaged equivalents.
How is audit defense priced?
Fixed-fee, scoped to the contractual estate, the named auditor, the inflection of the finding stack and the complexity of the environment. A typical engagement on a 10,000-seat EA buyer runs in the low- to mid-six-figure range with named-partner accountability. We do not take success fees and do not work on contingency — both create incentive misalignment with the buyer.
Do you work with Big Four auditors or against them?
Opposite them, as buyer-side counsel. The Big Four firm conducting the verification is retained by Microsoft. Our retainer is buyer-side only. We never take Microsoft Partner Network rebates, never take LSP referral fees, and never co-engage with a Big Four firm on a Microsoft audit. The auditor's job is to find unlicensed deployment; our job is to bound the scope, defend the methodology and negotiate the finding stack.
What if the audit is linked to an EA renewal?
This is one of Microsoft's most aggressive 2025-2026 commercial moves — opening a Verification concurrently with an EA renewal, then linking compliance settlement to renewal commercial terms. The defensive move is to separate the two negotiation tracks (different counterparties on the Microsoft side, different artifacts on the buyer side) and to structure any settlement as a future-licensing credit rather than a standalone cash payment. We have run this pattern dozens of times.
What if we have already responded to the notification?
The earlier we are in the room, the better. But the audit is not lost the day after the response was sent. We have entered audits at the data-analysis stage, at the finding-stack issuance, and even at the settlement-negotiation stage and produced material reductions every time. Worst case: an engagement letter that recovers a fraction of what an earlier engagement would have. Best case: the settlement is materially better than the buyer-side team thought possible.