This is an anonymised composite, built from patterns we see repeatedly across mid market Microsoft 365 engagements. The numbers are representative of what right sizing delivers, not a single named account. We use composites so we can be specific about the mechanics without exposing any client. The lesson, however, is concrete: when Microsoft 365 right sizing is done in the right order, a six figure annual saving is a realistic outcome.
Situation
The organization was a roughly 1,400 employee professional services firm operating across several regions. Microsoft 365 was by far its largest software line item, bought on an Enterprise Agreement with a renewal approaching. Over two previous renewal cycles the estate had drifted. A decision years earlier to standardize most of the workforce on the premium E5 tier had never been revisited. Headcount had changed, but seat counts had not been trued down. And a standalone meeting and webinar tool sat on its own contract alongside the meeting capability already included in the bundle.
Finance knew the bill felt high but had no benchmark and no internal time to take the estate apart. Procurement was facing the renewal quote with no independent view of what the right baseline should be. That is the point at which they brought us in, on a buyer side basis, with no vendor commission and payment only from the firm.
The overspend we found
The review worked from contracts, invoices, and usage data rather than assumptions. Three sources of overspend stood out.
The first and largest was tier over provisioning. A large share of E5 users were not using the premium features that justify the E5 premium over E3. Their actual usage looked like E3 usage. They had been placed on E5 by a blanket decision, not by need. The difference between the two tiers, multiplied across that population, was the single biggest line of waste.
The second was inactive seats. Successive joiner and leaver cycles had left a meaningful block of licensed seats assigned to people who had left or moved on. These were pure shelfware, paid for every month and used by no one.
The third was duplicate capability. The standalone meeting and webinar tool overlapped almost entirely with capability the Microsoft 365 bundle already included. The firm was paying twice for meetings, once inside the bundle and once on a separate contract.
Approach
We followed the sequence that makes these engagements work: right size and rationalize first, then negotiate the renewal, then put governance in place. Negotiating first on a bloated baseline would simply have locked in the overspend for another term.
Right sizing the tiers
We modelled the correct E5 and E3 split based on real feature usage. The teams that genuinely relied on E5 capabilities kept them. Everyone whose usage matched E3 was moved down. This protected capability where it mattered while removing the premium where it did not. The mechanics of this are covered in our right sizing Microsoft 365 licenses guide.
Reclaiming inactive seats
We cross referenced the licensed seat list against activity and leaver records and identified the inactive block for removal at the true up. This is the same discipline described in our license right sizing work.
Consolidating the duplicate tool
We showed the firm the side by side cost of keeping the standalone meeting tool right sized versus consolidating onto the bundle. The bundle already covered the need, so the standalone contract was retired. This is a textbook example of tool rationalization, folding a duplicate onto capability already owned.
Negotiating the renewal
With a clean, right sized baseline, the renewal was negotiated from evidence. The new agreement reflected the corrected seat count and tier mix and removed automatic uplifts, applying the principles in our SaaS renewal negotiation work. We did not interpret the contract for the firm; their own counsel handled that. We provided the commercial position and the numbers.
Outcome
The combined effect was an annual saving of approximately USD 480K against the previous run rate. The largest contributor was the E5 to E3 right sizing, followed by the reclaimed inactive seats and the retirement of the duplicate meeting tool. Several hundred seats were either downgraded or reclaimed, and one full vendor contract was removed from the stack. Because the changes were actioned at the true up and the renewal, the bulk of the saving landed within a single contract cycle rather than being spread over years.
Just as important, the firm kept everything the business actually used. No team lost a capability it relied on. The saving came entirely from removing premium licensing, idle seats, and a duplicate tool, never from cutting something productive.
Lessons for buyers
Three lessons carry across to any Microsoft 365 estate. First, revisit blanket tier decisions. A standardization on E5 made years ago is almost certainly wrong for a large share of users today, and the gap to E3 is where the money is. Second, true down before you renew. Inactive seats are the easiest saving in the stack and there is no reason to carry them into a new term. Third, look for duplication against the bundle. The capability you are buying separately may already be included in what you own.
The figures here are a composite and depend on plan mix, usage, and contract terms, all of which change often, so any benchmark carries an as of date. The mechanism, however, is repeatable. A spend assessment sizes the opportunity accurately for your own estate.