Microsoft rarely sends a blunt audit letter — most enforcement arrives as a SAM Engagement or SAM Optimization review run through a partner, and the 2026 pressure points are cloud entitlement, Azure Hybrid Benefit and SQL Server per-core counting under virtualization. This page explains how a Microsoft review works and what moves the number, then lists the independent firms that defend these reviews — each with pros and cons, listed, not ranked.
Last reviewed: 5 June 2026
Microsoft rarely opens with the word audit. Most enforcement arrives as a SAM Engagement or SAM Optimization review delivered through a partner, and Microsoft has leaned toward incentive-based “true-up to cloud” rather than punitive penalties. The exercise still ends in a compliance number, so it is treated as a defensible event from day one.
The mechanics turn on how three things are counted. Windows Server and SQL Server are licensed per core with a 16-core minimum per server; Client Access Licenses are per user or per device; and Microsoft 365 is subscription. The highest-value findings cluster around SQL Server core counting under VMware or Hyper-V, Azure Hybrid Benefit (AHB) applied to the same licenses twice, and SPLA reporting for hosting providers. A formal audit is a separate contractual right, but the defense levers are the same.
This page is general information about Microsoft licensing and audit defense, not legal, financial or licensing advice for your situation. Microsoft programs are described factually. Indicative figures, where shown, are labelled indicative.
Listed alphabetically with pros and cons — a directory, not a ranking. Selected for Microsoft coverage plus audit-defense work.
Large ITAM/SAM services firm that delivers Microsoft SAM engagements and ISO 19770 programs, and also conducts IBM audits on the vendor side.
Independent analyst house widely regarded as an authority on Microsoft licensing rules, used to interpret entitlement and contest engagement findings on the rules themselves.
German independent, vendor-neutral SAM and audit-defense boutique covering Microsoft alongside Oracle, SAP and Adobe across the DACH region.
Independent boutique founded by ex-vendor auditors, covering Microsoft, Oracle, SAP and IBM under a strict no-resell, no-implement, no-vendor-audit model.
Independent multi-vendor boutique covering Microsoft, Oracle, SAP, IBM and Tier-2 publishers across audit defense, negotiation and compliance.
Canadian independent boutique focused on Microsoft audit defense and optimization, also covering IBM, Oracle, SAP, Adobe and VMware.
Independent, buyer-side boutique covering Microsoft alongside Oracle, SAP, IBM, Broadcom, Salesforce, ServiceNow and Workday, across audit defense through renewals.
Listed alphabetically — not a ranking. Independence is shown as a pro and reseller, Big-Four or vendor-side-audit ties as a con, stated as factual trade-offs for you to weigh. Firm details are compiled from public sources and are unverified (demo) until the verified registry is live.
Indicative — directional patterns from how Microsoft engagements tend to resolve, not a quote or a guarantee. Specific figures are not published until the verified registry is live.
| LEVER | WHAT IT CHANGES | INDICATIVE EFFECT |
|---|---|---|
| AHB reconciliation | Confirms Azure Hybrid Benefit is applied without double-counting cores | Indicative: removes a common over-claim in SQL and Windows findings |
| SQL core re-count | Counts SQL Server on used cores under eligible virtualization | Indicative: often the single largest line in a Microsoft finding |
| CAL true-up scoping | Limits the user / device CAL gap to what is actually deployed | Indicative: narrows the claimed shortfall |
| Engagement framing | Keeps a SAM engagement from drifting into a punitive audit | Indicative: changes posture and timeline, not just price |
The pattern in Microsoft work is that most of the swing comes from how cores, CALs and cloud entitlements are counted, not from a discount. Getting the measurement right is also what keeps a SAM engagement collaborative rather than adversarial.
The same Microsoft estate, viewed through the service you need.
The Microsoft audit & negotiation operation →
Ongoing Microsoft SAM & ITAM →
AHB and licensing-by-design →
EA / MCA renewal & true-up →
The service across all vendors →
SQL core reconciliation & ELP →
Not formally. A SAM Engagement or SAM Optimization review is positioned as collaborative and is usually run through a partner, while a formal audit is a contractual right exercised directly. The practical difference is posture: an engagement can still produce a compliance number and a true-up, so it is treated as a defensible event, but the framing and timeline are more negotiable than a formal audit.
SQL Server is licensed per physical core with a 16-core minimum per server. Under virtualization you either license the virtual cores assigned to a VM or license the full physical host for unlimited VMs, and eligible virtualization plus Software Assurance changes which is cheaper. Mis-counting here is the most common high-value Microsoft finding.
Yes. Azure Hybrid Benefit lets you reuse on-prem Windows Server or SQL Server licenses in Azure, but the same licenses cannot cover on-prem workloads at the same time. A frequent finding is on-prem cores claimed as a shortfall while the same licenses are applied to Azure, so reconciling AHB usage is a routine defense lever.
Common triggers include an EA or MCA renewal approaching, large swings in cloud consumption, SPLA reporting for hosters, and mixed on-prem and cloud estates where entitlement is hard to track. A renewal is the most frequent moment for a SAM engagement to begin.
No. This is a directory, not a ranking. Firms are listed alphabetically with balanced pros and cons. Independence is shown as a pro and reseller, Big-Four or vendor-side-audit ties as a con, both stated as factual trade-offs for you to weigh.
No. The directory and the matching service are free for buyers. We take no money from software publishers and add no markup, and no vendor ever sees your brief.
Tell us where your Microsoft review stands — engagement, data request or findings. We route your brief to firms covering Microsoft audit defense. The directory and matching are free for buyers, no vendor ever sees your brief, and we add no markup.
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