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It s a good idea to deploy two hub transport servers of both versions inside large sites that support many mailbox servers to avoid creating a single point of failure . Virtualization is a great way to lower the amount of additional hardware required to maintain the two sets of hub transport servers until you can complete the migration to Exchange 2010 .
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The requirement to support version-based routing does not compromise the general advice for the order of deployment for Exchange 2010 server roles. You should still deploy CAS servers first, followed by hub transport servers and then mailbox servers. The issue to incorporate into planning is the need to keep at least one Exchange 2007 hub transport server in a site until the last Exchange 2007 mailbox server is removed from that site. Although it appears complex, the solution of forcing mailbox servers to communicate with a hub transport server running the same version is a good one. The alternative was to force the creation of a separate Active Directory site to support Exchange 2010 servers, which would create a huge amount of complexity within an organization, because you d need to pair up every existing Active Directory site that contained Exchange 2007 servers with a corresponding site for Exchange 2010 and then install the Exchange 2010 servers into the new sites. After doing all this work, you d then have to arrange for the old Active Directory sites to be removed after you decommission Exchange 2007.
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Overview of the transport architecture
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RPC Exchange 2007 mailbox servers Exchange 2007 HT
Figure 13-2 Version-based routing.
The X.400 question
If you re migrating from Exchange 2003, you might ask what role the X .400 protocol plays in Exchange 2010 . After all, X .400 was the original transport protocol used to connect servers in the days when Exchange still had a tentative relationship with the Internet, a fact that is obvious from the X .400 address stamped on every legacy Exchange mail-enabled object . Although this is all true, the fact is that Exchange has been migrating away from X .400 since Exchange 2000 was released and that process was complete in Exchange 2007 . No Exchange 2010 object requires an X .400
13 The Exchange Transport System
address to function and X .400 is never needed for connectivity unless you install an X .400 connector hosted on an Exchange 2003 server to communicate to some legacy email system that still can t talk SMTP . In the vast majority of cases, once you have moved over to a pure Exchange 2007/2010 environment, you can cheerfully forget all about X .400 and remove any X .400 addresses that linger in the properties of mail-enabled objects . You don t have to delete these addresses if you don t want to . Short of occupying some bytes of storage, they do no harm if left alone .
Transport configuration settings
In Exchange 2000 and Exchange 2003, the Global Message settings define properties such as the maximum message size. Exchange 2007 does not provide the ability to set global messaging defaults through EMC. With Exchange 2010, you can go to the Hub Transport section of the Organization Configuration and click Global Settings to access some of the settings that control how the transport system works. Figure 13-3 illustrates what you will see on the General tab of the Transport Settings Properties dialog box.
Figure 13-3 Global transport settings.
Inevitably, EMC can only display a subset containing the most commonly altered global transport settings through its user interface. Full access is gained by using the Get-TransportConfig cmdlet to retrieve the settings and the Set-TransportConfig cmdlet to
Transport configuration settings
define transport configuration settings for the organization. In a mixed-mode organization, existing settings such as those that govern the maximum size of an incoming message, the maximum size of an outgoing message, and the maximum number of recipients allowed per message are retained, but in a new Exchange organization the value for these parameters is set to be 20 MB. For example, the settings reported by the Get-TransportConfig cmdlet for an organization might look like the output shown next. If you compare this with the output from an Exchange 2007 organization, you ll see that Exchange 2010 has added quite a few additional settings that you can tweak. Some of these properties (for instance, MigrationEnabled and OpenDomainRoutingEnabled) are reserved for Microsoft internal use when Exchange is deployed in Microsoft s hosted Business Productivity Online Services. Others, such as ShadowHeartbeatTimeoutInterval, are used to control new functionality introduced in Exchange 2010 (see the section Transport pipeline later in this chapter for more information about shadow redundancy).