We are announcing that we are taking the next step in our commitment to the resilience and availability of Azure Key Vault service. Key Vault is now being offered at a 99.99% availability SLA, an improvement over our previous 99.9% SLA. With this update, Azure Key Vault guarantees that valid Key Vault requests will have availability 99.99% of the time. This change is the result of our ongoing promise to safeguard and maintain control of keys and other secrets in Azure.
For details, see the SLA definition.