Azure has become the largest and least governed line in most Microsoft agreements. The commitment a buyer makes today sets the floor on spend for years. This white paper sets out the buyer side method for sizing that commitment to real consumption, choosing between reserved instances and savings plans, and capturing the hybrid benefit you have already paid for. The goal is the lowest defensible cost, not the largest commitment the account team can book.
Microsoft frames the Azure commitment as a discount mechanism. In practice it is a forecast you are asked to underwrite, and the party that controls the forecast controls the price. This paper reframes the Azure commitment as a buyer side discipline. It walks through sizing a Microsoft Azure Consumption Commitment to observed run rate rather than an account team projection, the difference between reserved instances and savings plans and when each earns its place, and the Azure Hybrid Benefit that many estates leave unclaimed on Windows Server and SQL Server. It then addresses the quiet cost of over commitment, where a commitment booked above real consumption converts a discount into a penalty. The method is the one the practice runs on live engagements: build the consumption picture first, commit to the floor, and leave the upside to flexible instruments rather than to a number signed under deadline pressure.
This paper reflects method developed across hundreds of Microsoft engagements. The figures below are firm level and reflect cumulative results across the practice.
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