Removal of the separate CAS role does not affect how communication occurs between servers. Database failovers times are reduced by 33% when compared to Exchange Server 2013.Lagged database copy play down can be delayed based on disk latency, thereby ensuring active users are not impacted.Replay Lag Manager is enabled by default.By default, the failover cluster will be created without an administrative access point, as this is the recommended best practice. DatabaseAvailabilityGroupIpAddresses is no longer required when creating a DAG.DAGs in Exchange Server 2016 do have a few specific enhancements: Mailbox servers can be added to a Database Availability Group (DAG), thereby forming a high availability unit that can be deployed in one or more datacenters. No clients connect directly to the back-end endpoints on the Mailbox server instead, clients connect client access services and are routed (via local or remote proxy) to the Mailbox server that hosts the active database that contains the userвЂ™s mailbox.

Hosts all of the components and/or protocols that process, render and store the data.Houses the logic to route protocol requests to the correct destination endpoint.Even without the CAS role, the system maintains loose coupling in terms of functionality, versioning, user partitioning and geographical affinity. In our continuing quest to improve the productвЂ™s capabilities and simplify the architecture and its deployment, we have removed the Client Access server (CAS) role and added the client access services to the Mailbox role. In Exchange Server 2016, there is a single building block that provides the client access services and the high availability architecture necessary for any enterprise messaging environment. Exchange Server 2016 builds upon the architecture introduced in Exchange Server 2013, with the continued focus goal of improving the architecture to serve the needs of deployments at all scales.

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