Better High availability: Public folders use regular mailbox databases. In turn, this means that they can be made part of database availability group for disaster recovery. The store service has been completely rewritten in C#. Now each database runs in its own dedicated worker process, so a hung process in one database will not cause problems in other databases. The Lagged copy enhancements with the new Safety Net replaces the transport dumpster and provides a similar service by storing copies of messages that are successfully delivered to the active database of a mailbox server. You can now have an automatic failover of your primary data center. The only condition is to get three different sites, but the automatic failover is easy to deploy and increases resiliency of the site..