Microsoft has the widest review reach of any publisher, but it usually arrives as a Software Asset Management (SAM) engagement tied to an Enterprise Agreement renewal rather than a punitive audit. Whether you face a review, an EA renewal, or both at once, this hub explains how Microsoft licensing works, maps the products that get measured, and lists the firms that defend and negotiate on the buyer's side.
Last reviewed: 5 June 2026 · A directory, not a ranking. Information, not legal advice.
Microsoft enforces compliance less through formal contractual audits than through SAM engagements and SAM Optimization programs, frequently delivered by a partner and framed as a free optimization service. The commercial pressure point has shifted from on-premises servers toward cloud entitlement: Azure Hybrid Benefit, hybrid use rights, and the alignment of Microsoft 365 subscriptions to actual assigned users. Around half of organisations report being audited or reviewed by Microsoft at least once, the highest reach of any publisher, though Microsoft has generally preferred an incentive-based true-up to cloud over punitive penalties.
Because a review and an Enterprise Agreement renewal are so often run together, defense and negotiation are two sides of one engagement. The recurring moves are a partner-led SAM engagement that functions as discovery, true-up demands surfacing at renewal, intricate per-core and CAL counting read against the customer, and findings timed to the EA renewal cycle. Recognising the SAM engagement for what it is, and controlling the data that leaves your network, preserves leverage into the renewal.
Microsoft licensing spans per-core server products, per-user and per-device access licenses, and per-user cloud subscriptions, each with its own counting rules. The table summarises where findings most often arise.
| Product | Primary metric |
|---|---|
| Windows Server | Per-core, 16-core minimum per server |
| SQL Server | Per-core under virtualization, or Server + CAL |
| Microsoft 365 / Office 365 | Per-user subscription by plan |
| Client Access Licenses (CALs) | Per-user or per-device |
| SPLA | Monthly usage reporting for hosters |
| Dynamics 365 / Power Platform | Per-user and capacity-based |
This hub lists firms; it does not rank them. They appear in neutral alphabetical order by firm name, and no firm is marked best, top, leading, or recommended. Independence, meaning no Microsoft partnership, no reseller relationship, and no commission, is listed as a pro, because incentives then align with reducing your exposure. A reseller or Microsoft-partner relationship is listed as a con, because selling Microsoft licenses is a potential conflict with buyer-side defense. Neither is a verdict; both are factual trade-offs for you to weigh.
Listed alphabetically with balanced pros and cons. A directory, not a ranking.
Independent Microsoft-licensing analyst firm and authority on Microsoft licensing rules and roadmap.
German vendor-neutral consultancy with a SAM and audit-defense practice across the DACH region.
Global solutions integrator and reseller offering Microsoft and multi-vendor renewal and advisory services.
Independent multi-vendor licensing advisory covering audit defense, negotiation, and ongoing optimization, including Tier-2 publishers.
Independent UK Microsoft-licensing and SAM boutique that does not resell Microsoft licenses.
Independent Canadian boutique combining audit defense with data-driven license optimization across major vendors.
Established independent Oracle and Microsoft licensing and SAM advisory based in New Jersey.
Independent, buyer-side licensing advisory with the broadest multi-vendor coverage in our registry.
Independent Microsoft and Azure SAM boutique with no Microsoft partnership and a strong public voice.
Global licensing solutions provider offering SAM and advisory services alongside license resale.
Independent IT sourcing and negotiation advisor with no vendor ties, focused on large enterprise deals.
Microsoft enterprise-agreement procurement and third-party-support provider and Microsoft partner.
Listed alphabetically by firm name, not a ranking. Every firm shows balanced pros and cons. Independence is shown as a pro and a reseller, Big-Four, or vendor-side audit relationship as a con, both as factual trade-offs for you to weigh. Firm data is demo until the verified registry is live.
Pick the work you need: defense, negotiation, renewals, advisory, ELP, SAM, or cloud cost.
Defend a Microsoft SAM engagement or formal review. →
New EA, MCA, and cloud-commit deals. →
EA true-up, true-forward, and uplift control. →
Azure Hybrid Benefit and licensing-by-design. →
SQL Server core and CAL reconciliation. →
Ongoing managed SAM and ITAM. →
M365 and Azure spend optimization. →
Local procurement culture and legal context differ by market. Pick yours for the firms serving it.
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A SAM engagement is positioned as a collaborative optimization review rather than a formal contractual audit, but it can surface a compliance gap and a true-up demand, so it is treated with the same care as an audit. Microsoft has leaned toward incentive-based true-up to cloud over punitive enforcement, but the financial outcome can be the same.
SQL Server is licensed per physical core with a four-core minimum per instance, but virtualized deployments can be licensed per virtual core or, with Software Assurance, by licensing all physical cores on a host for unlimited virtualization. Mis-applying these rules is one of the most common and most expensive Microsoft findings.
Azure Hybrid Benefit lets you apply existing Windows Server or SQL Server licenses with Software Assurance to Azure, but using the same licenses on-premises and in Azure beyond the permitted dual-use window creates exposure. Reconciling AHB usage is a frequent area of dispute at review.
Enterprise Agreement renewal is the most common trigger, along with Azure Hybrid Benefit mis-application, hybrid use rights, SPLA under-reporting, and mixed on-premises and cloud estates. The review and the renewal are often run together, which is why negotiation and defense overlap.
Some are independent buyer-side advisers and some are resellers or Microsoft partners. The directory shows each firm's status plainly: independence is listed as a pro and a reseller or partner relationship as a con, both as factual trade-offs for you to weigh.
Yes. The directory and matching are free for buyers, no vendor sees your brief, and we take no money from software publishers.