You can now enable all versions and deletes change feed mode on your Azure Cosmos DB for NoSQL accounts without registering your subscription for the Preview. Before enabling this change feed mode, continuous backups must be turned on in your account. You can enable this change feed mode in the Features blade of your Azure Cosmos DB account in the Azure portal.
Reading the change feed in all versions and deletes mode gives a record of each change that occurred to items within a container, including changes from delete operations and TTL expirations. In this mode, you can only read changes that occurred within the continuous backup period configured for the account. Existing change feed applications will continue to use latest version change feed mode, and new applications can be built in either mode.