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Benefits of relocating the MAPI endpoint
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Although relocating MAPI connectivity to the CAS might seem to be simple housekeeping completing the task of bringing all protocol access together it also delivers five real benefits to Exchange. First, all protocols now flow through a common code path. This
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makes it much easier for Exchange developers to implement consistent processing of data across all clients. In the past, it was entirely possible for different clients to process information generated by clients in different ways because the code was implemented in the CAS or mailbox server. Second, because all of the protocol and client access code is now located within the CAS, the vast bulk of the code that handled MAPI client connectivity could be removed from the mailbox server; the only vestige that remains is the code that handles public folder connections. Server-to-server MAPI connectivity code also remains within Exchange, but is never exposed to MAPI clients such as Outlook.
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The removal of layers of code, some of which dated back to the earliest Exchange versions, makes it easier for developers to tune mailbox servers to support higher loads and improves the overall stability of the server because there is less code to run and fewer places for bugs to lurk .
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The third benefit is a more scalable and streamlined approach to the way that client connections are processed. Exchange 2007 maintains a more complicated set of connections between clients and servers than Exchange 2010 does. An Outlook client connected to Exchange 2007 maintains persistent connections (connections that don t drop) to the mailbox server and global catalog server (for DSProxy access to directory information). This works well except when the servers are called on to handle a heavy load of TCP connections that have to flow through the CAS, such as when Outlook Anywhere is used. Now, the initial connection has to flow from Outlook to the CAS, and then the CAS makes connections on behalf of Outlook to the mailbox server and global catalog. The persistent nature of the connections caused bottlenecks to occur under conditions of heavy load. Exchange 2010 doesn t use persistent connections. Instead, it recognizes an Outlook Anywhere connection and saves its session state information in memory. The CAS has a shared pool of 100 connections with mailbox servers that it can use for active connections. If a user doesn t need to do anything, her connection can remain inactive. Once she wants data, the client can use one of the shared connections and then release it afterward. By using the shared pool of constantly reused connections, the CAS scales better than it can when faced with the need to manage an escalating demand for persistent connections. The fourth benefit is the introduction of the address book service to replace the older DSProxy service s connection (used since Exchange 2000) to the global catalog to retrieve directory information. The address book service on the CAS is a true endpoint that serves clients as the definitive reference for directory data instead of just acting as an intermediate proxy. The code is simpler, resolves the issue of split connections that arose with Outlook Anywhere clients, and fixes a lingering problem for address book updates in multidomain deployments. These problems occurred when a client attempted to update a group. For
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The CAS role
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example, an Outlook client might select a group from the Global Address List (GAL) and then attempt to amend its membership. Everything worked if DSProxy had connected the client to a global catalog that held a writable copy of the group. It didn t work when the global catalog belonged to a different domain from the group and so only held a readonly copy. The address book service now detects when problems might occur with group updates and routes the update to a suitable global catalog to make the change. Similar code handles other similar issues that used to occur with delegates and certificates, proving the value of being able to implement business logic in a single consistent place. Last, because Exchange 2010 manages client connectivity at the CAS rather than dividing it between CAS and mailbox server, the time required for a client to transition to a moved database following a failover is much improved. Sorting out the connections for a transition to a new mailbox copy running in an Exchange 2007 Local Continuous Replication (LCR) or Standby Cluster Replication (SCR) configuration can take a couple of minutes before service is fully restored to clients. It s true that Outlook clients configured in cached Exchange mode won t be aware of the nature of the interruption, but it still exists, and OWA and other clients experience the full duration of the outage. The Exchange 2010 CAS is better able to manage these transitions, and the target failover time is now 30 seconds or less.
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