Taking that goal into consideration along with the 64 - bit memory addressing scheme, more objects are
now cached into memory on mailbox servers, requiring mailbox servers to have more memory but
allowing for less expansive disk systems.
Server roles have evolved from prior editions as well. CAS servers have an increased role over their
previous Exchange 2003 front - end counterpart. Just like front - end servers did, CAS handles all of the
web - based user connections. However, CAS also handles the new Autodiscover and Availability service.
This service is critical because it replaces the free/busy public folder and it also serves as an automatic
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configuration tool. The hub takes on an increased role due to the fact that all messages, even those sent
to users on the same mailbox server, now must pass through the Hub server. If increased security is
needed, Edge servers can be deployed to handle the Internet point of presence for SMTP for the
organization. Because the servers are not on the domain, in the event of compromise, the attacker does
not automatically obtain the ability to have permissions in AD. Though Unified Messaging is not new
technology, incorporating it natively into an Exchange product is. This allows for tighter collaboration
between Unified Messaging and Office Communication Server.
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