Connecting to Outlook
Another major change in Exchange 2013 is in the role of Microsoft's RPC-based Messaging API (MAPI). Previously, the Outlook clients used two transport options for RPC traffic: HTTP or TCP. With Exchange 2013, RPC/TCP is no longer supported as a connectivity solution; only RPC/HTTP (also known as Outlook Anywhere) is supported.
Changing the protocols used for communication between the CAS and Mailbox server roles from RPC/TCP to a protocol that is more tolerant to latency and throughput over Internet and WAN connections allows these roles to not be as tied together from a geographical or user affinity perspective as they were before. This change allows CASs in one Active Directory site to authenticate and proxy requests to ...
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