Exchange 2013 continues to improve in areas such as high availability, storage, and site resilience. Even though Database Availability Groups (DAGs) and Windows Server Failover Clustering remain the technologies used to achieve site resilience for the Mailbox server role, site resilience, in general, has been considerably enhanced. With Exchange 2013, it becomes much simpler to configure and achieve site resilience due to all the underlying architectural changes introduced.

There is no doubt that with Exchange 2010 it was easier than ever to achieve site resilience. With good planning and by introducing DAGs and extending these across two or more datacenters, administrators could activate a second datacenter quicker than ever in order to continue to provide messaging services to users. This was done through a datacenter switchover, which although better than ever, was still a manual, complex, and usually time consuming process. Its complexity came from...