Unified Messaging is a new feature that has been added to Exchange Server 2007. In a standard
deployment, your organization may or may not use this feature. It is not required in order for your
environment to run, however the increased functionality and integration with Office Communication
Server allow for a tighter collaboration of messaging technology. With a standard deployment, one
UM server should be deployed to every site. If UM is a key piece of technology within the organization,
multiple servers can be deployed and have membership in multiple dial plans. UM can coexist with all
other roles except Edge, and cannot be installed on an MSCS cluster.
Complex Deployments
A large deployment can be one that spans multiple physical sites, multiple domains, or even multiple
forests. Exchange server placement is highly dependent upon roles and user presence. Edge Transport
servers can be geographically dispersed to allow for site redundancy. Hub Transport, Client Access, and
mailbox servers can be consolidated to just one data center or geographically dispersed. Server
placement depends upon the network infrastructure, the logical boundaries of the domain, and user
need. Figure 3 - 2 shows a multisite, multidomain configuration. The Exchangeexchange.local forest
has two child domains, US and EU.
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