Generally Available: Transition existing platform-managed keys (PMK) to customer-managed keys (CMK) for Azure NetApp Files volumes without data migration.

Key benefits of CMK are: 

• Secure key management: The keys are generated and managed by the customer organization. This provides additional security layer by reducing the risk of unauthorized key access. This provides protection against insider threats and unauthorized data access. 

• Regulatory/compliance: Several entities have strict regulations for data protection. CMK helps comply with various requirements and provide ability to track key management for regulatory purposes. 

• Performance:  There is no performance impact when using CMK.  It simply protects the account encryption key using the Azure Key Vault.