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Related: Exchange Server 2013 SP1: A Mixture of New and Completed Features In effect, RPCs allow applications to get on with the task of providing their unique functionality instead of having to constantly reinvent the networking wheel, even if occasionally you need to mess around with settings to make everything work.
(The method described in "XGEN: Changing the RPC Binding Order" might bring back memories—or nightmares—about some of the fine-tuning required in early Exchange deployments.) In early Exchange deployments, the RPCs connecting Exchange and its clients traveled across many different protocols, including TCP/IP, Net BIOS, and named pipes.
And the sensitive nature of RPCs mean that Outlook often has to restart activities because a disruption happens, such as moving between two wireless access points.
The chatty nature of RPCs, the increasing size of messages, and large attachments (e.g., digital photos, music files, Microsoft Power Point presentations) all make for more extended connections.
However, things are a bit uglier behind the scenes.
EAS and OWA are both able to manage this kind of environment better than Outlook, which continually loses and restores connections at the expense of a great deal of network activity, most of which is hidden from end users by the cached Exchange mode.
Outlook Anywhere solves the problem by using two HTTP connections to carry the RPC traffic and session affinity to keep the links synchronized with each other.
This arrangement is well known to administrators who set up load balancers to deal with Outlook Anywhere connections.
For example, HTTP is a half-duplex connection—in other words, it can carry traffic in a single direction.
RPCs need full-duplex connections with synchronized inbound (RPC_IN_DATA) and outbound (RPC_OUT_DATA) links.
MAPI over HTTP provides the ability for Messaging API (MAPI) clients and servers to communicate across a HTTP connection without using remote procedure calls (RPCs).