General availability: Customer-managed keys on existing accounts

We are pleased to announce that you can now enable Customer Managed Keys (CMK) on existing Azure Cosmos DB accounts. This eliminates the need to migrate data to a new account to enable CMK.   
 
This release follows the existing ability to enable a second layer of encryption for data at rest using CMK while creating a new Azure Cosmos DB account.   
 
Using these features can help you to improve your security and compliance posture. Learn more.