How it works: Services in series multiply their SLA percentages. A chain of 99.99% × 99.95% × 99.99% = 99.93%. The composite SLA is always lower than the weakest individual service. SLA values reflect Microsoft's published guarantees for standard configurations as of early 2026. Some services offer higher SLAs with zone-redundancy or premium tiers — hover over the ⓘ icon for details. Always verify with the
official SLA documents.