Microsoft licensing optimization
Microsoft licensing optimization is an independent review of your Microsoft 365, EA, or CSP licensing that matches what you pay for to what your people actually use: right-sizing plan tiers, removing unused add-ons, reharvesting idle licenses, and timing renewal negotiations. Stackstone's assessment is free; compensation for optimization work is disclosed per engagement, typically standard supplier commissions.
Where do Microsoft licensing costs go wrong?
Microsoft is usually one of the largest single lines in a company's software budget, and it is also one of the least reviewed. The licensing catalog is complicated enough that most businesses default to whatever was set up years ago, then add to it. The overspend concentrates in a few predictable places:
- Blanket plan assignment, every user on E3 or E5 because it was simpler at setup, even though many only use email, files, and Teams.
- Unused add-ons, extras like advanced telephony, analytics, or premium security SKUs bought for a project or a pilot and never rolled back.
- Departed-employee licenses, seats that stay assigned after offboarding. Without a reharvesting process, new hires trigger new purchases while paid licenses sit idle.
- Overlapping third-party tools, separate subscriptions for security, e-signature, storage, or conferencing that duplicate capabilities already included in the Microsoft tier you pay for.
- Auto-pilot renewals, EA true-ups and renewals signed under deadline pressure, at the vendor's opening position, because preparation started too late.
Each of these is fixable without changing how anyone works. That is the point of optimization: same tools, same vendor, lower bill.
E3, E5, or Business Premium: is every user on the right plan?
The single biggest Microsoft savings lever is tier mismatch. The plans differ meaningfully in price, and the differences only pay off if the features are actually used. A simplified view:
| Plan | Designed for | Common mismatch |
|---|---|---|
| Business Premium | Organizations up to 300 users; core productivity plus solid device and identity security | Eligible companies paying for E3 out of habit or on a reseller's default recommendation |
| Microsoft 365 E3 | Larger organizations needing enterprise management and compliance, with no seat cap | Assigned to every employee when frontline or light-use plans would cover many of them |
| Microsoft 365 E5 | Organizations that will actually operationalize its advanced security, compliance, and analytics | Bought company-wide for one feature, while cheaper E3-plus-add-on mixes go unexamined |
Right-sizing is rarely all-or-nothing. Most organizations end up with a mix: a smaller group that genuinely needs the top tier, and a larger group moved to plans matching what they use. The mismatch only surfaces when someone compares assigned features against actual usage, user by user.
What is license reharvesting?
Reharvesting is the discipline of reclaiming licenses that are assigned but idle, typically seats belonging to departed employees or users who never adopted a product, and reassigning them to new hires instead of buying more. Admin-center usage reports make idle licenses visible; the gap is usually process, not data. Offboarding checklists that release licenses, a monthly reclaim pass, and a rule that new purchases require a reclaim check first will turn licensing into a closed loop. It is one of the fastest savings available because it requires no negotiation and no change for end users.
EA or CSP: which agreement fits your business?
How you buy matters as much as what you buy. The two main routes trade commitment for flexibility:
- Enterprise Agreement (EA), a multi-year commitment suited to larger organizations. Pricing is locked for the term, but you commit to a license baseline, and annual true-ups capture growth. Shrinking headcount generally does not reduce the bill until renewal, which is why oversized baselines are so costly.
- Cloud Solution Provider (CSP), purchasing through a partner with monthly or annual terms. Flexibility to scale seats down as well as up, which suits businesses whose headcount moves. Microsoft has also been steering smaller accounts toward CSP as EA thresholds shift.
The right answer depends on size, growth pattern, and how much flexibility is worth to you. An independent review models both routes against your actual usage, rather than defaulting to whichever one your reseller earns more on. That distinction is covered in independent advisor vs. reseller.
When should you start preparing for a Microsoft renewal?
Earlier than feels necessary. For an EA, preparation should start six to nine months before the anniversary: long enough to audit usage, model tier changes, reharvest idle licenses, and let the negotiation play out without deadline pressure. Renewals signed in the final weeks almost always land at the vendor's opening position. For CSP, the same audit discipline applies at each annual term. Our guide on when to review technology contracts covers the renewal calendar in detail, and walking into a negotiation with a right-sized baseline is the strongest leverage you can bring, because you are no longer negotiating over licenses you don't need.
Why use an independent advisor instead of your reseller?
Your Microsoft reseller can be genuinely helpful, but their revenue grows when your license count grows, and it is rare for a reseller to proactively recommend downgrades. An independent advisor sits on your side of the table: independent, with no licenses to sell, and disclosing exactly how it is paid for your engagement. You keep Microsoft, and in most cases you keep your existing partner relationships too; what changes is who is doing the math. Microsoft licensing is also one slice of a broader technology spend assessment, where software and SaaS reviews typically recover 15–25% of spend (industry benchmarks; results vary), and the same discipline across telecom and vendors often finds more.
How does Stackstone get paid?
The assessment is free. For optimization work, we're typically compensated through standard supplier commissions on the contracts we help you source and manage, so there is usually no direct cost to you. We never charge hourly or retainer fees; if an engagement ever includes a fee at all, it's only a share of savings actually realized, agreed in writing up front. We disclose how we're paid for your engagement so you can weigh the advice accordingly. The full picture is in how technology consultants get paid.
By Shane Stewart, Founder of Stackstone Advisory, independent technology spend advisor.
Last updated: July 2026.
Common questions
What is Microsoft licensing optimization?
Microsoft licensing optimization is an independent review of your Microsoft 365, EA, or CSP licensing that matches what you pay for to what your people actually use. It covers plan-tier mismatches, unused add-ons, licenses still assigned to departed employees, and the agreement structure and renewal timing that determine your pricing.
What is the difference between E3, E5, and Business Premium?
Business Premium is Microsoft's plan for organizations up to 300 users and covers most core productivity and security needs at a lower price point. E3 adds enterprise-grade management and compliance capabilities with no seat cap. E5 layers on advanced security, compliance, and analytics features. The common mistake is putting every user on E3 or E5 when many only use what a lower tier provides.
Can we reduce Microsoft 365 costs without leaving Microsoft?
Yes. Most Microsoft savings come from right-sizing what you already have: moving users to the correct plan tier, removing unused add-ons, reharvesting idle licenses, and negotiating the renewal properly. You keep Microsoft, and in most cases you keep your existing partner relationships too.
What is license reharvesting?
License reharvesting is the practice of reclaiming licenses that are assigned but not used, typically seats belonging to departed employees or users who never adopted a product, and reassigning them to new hires instead of buying more. It turns license management into a closed loop and is one of the fastest Microsoft savings available.
Should we buy through an EA or CSP?
It depends on your size, growth pattern, and appetite for commitment. Enterprise Agreements suit larger organizations that want fixed pricing in exchange for a multi-year commitment; CSP offers month-to-month or annual flexibility through a partner and suits organizations whose headcount moves around. An independent review models both against your actual usage before you commit.
How much does a Microsoft licensing review cost?
The assessment is free. For optimization work, we're typically compensated through standard supplier commissions on the contracts we help you source and manage, so there is usually no direct cost to you. We never charge hourly or retainer fees; if an engagement ever includes a fee at all, it's only a share of savings actually realized, agreed in writing up front. We disclose how we're paid for your engagement so you can weigh the advice accordingly.
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