Situation: an audit letter lands on a bloated estate
A 1,400 employee insurance and financial services group received a formal license review request from Microsoft. The estate had grown through three acquisitions in five years. Nobody owned the full picture. The group ran a mix of E3 and E5 on an Enterprise Agreement, with frontline F3 in two subsidiaries and a scatter of add ons bought by individual teams. Finance feared a large true up bill and a back charge for under licensing.
The internal team had two instincts, both expensive. The first was to buy more licenses quickly to look compliant. The second was to accept whatever number the review produced. Neither tested whether the group was actually using what it already paid for.
The overspend found
A full reconciliation of entitlements against active usage told a different story. The group was not broadly under licensed. It was badly mismatched. Roughly 18 percent of E5 seats showed no use of the security and compliance features that justify the E5 premium over E3. Around 600 accounts were still active for leavers and contractors who had departed. Several add ons duplicated capability the group already held inside E5.
The headline risk in the audit was real but narrow. A single workload had been deployed more widely than its licensing covered. That gap was a fraction of the size of the ongoing waste sitting in the wrong tiers and the stale accounts. The audit had simply pointed a spotlight at an estate nobody governed.
Approach: how a firm defends a Microsoft audit and right sizes
The engagement ran in two tracks. The first track was audit defense. We reconciled the deployment data, established the firm's own position with evidence, and scoped the genuine compliance gap precisely so the group never conceded more than it owed. We worked alongside the group's own counsel on contract interpretation rather than offering legal advice ourselves.
The second track was right sizing. We mapped every E5 seat to actual feature use and identified the population that could move to E3 with no loss of function. We flagged the leaver and contractor accounts for reclamation. We listed the duplicate add ons for removal at the next renewal point. We then sequenced the changes so the true up settlement and the downgrades were negotiated together, which gave the group leverage it would not have had treating them separately.
Outcome: a smaller, cleaner, cheaper estate
The settled compliance gap came in well below the group's worst case fear because the firm arrived with its own reconciled numbers rather than reacting to the vendor's. Roughly 600 stale accounts were reclaimed. About 220 E5 seats moved to E3 where the premium tier was never used. Duplicate add ons were cut at renewal. The combined effect was a reduction in annual Microsoft spend in the high teens as a percentage, alongside a true up bill that landed at a manageable level.
The group also walked away with something it lacked before: a clean entitlement baseline and an owner for it. The next review will not be a scramble.
Lessons for buyers
An audit is the wrong time to panic buy and the right time to right size. The data you gather to defend a review is the same data that exposes the waste. Treat the two as one project. A few principles repeat across these engagements.
First, never accept the vendor's number without building your own. Reconcile entitlements against real usage before any conversation. Second, separate the genuine compliance gap from the broader mismatch, because they are negotiated differently. Third, fold downgrades and reclamation into the audit settlement so you negotiate from a single, stronger position. Fourth, leave the engagement with an owner and a baseline so the estate does not drift back.
This pattern sits inside a wider discipline. To see how Microsoft fits the full picture, read the digital workplace cost optimization pillar. For the recurring estate work behind this outcome, see our Microsoft 365 optimization service and the broader license right sizing service. Related composites include a healthcare group that right sizes E5 to E3 and a company that negotiates its Microsoft 365 EA down.
Plan structures referenced here (E3, E5, F3, Enterprise Agreement true up) reflect Microsoft commercial licensing as of June 2026. Vendor pricing and plan mechanics change often, so confirm current terms before acting.