The RPC Client Access layer
Chapter 8, discusses how the introduction of the Database Availability Group (DAG) enables Exchange to support multiple copies of a database. Establishing the ability to have multiple database copies adds substantially to the system designer’s ability to construct solutions that resist server outages, but the real magic is not in the replication of log files between servers. After all, Exchange 2007 also supports log shipping. Instead, the big breakthrough that enables DAG technology to work is the relocation of the connection point for MAPI clients away from the mailbox server to the CAS. In the past, Outlook clients expected to know which server hosts the database that holds the mailbox they want to access by reference ...
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