Answer / muthiah nagarajan

Exchange Virtual Server is a clustered Exchange
installation. When Exchange is installed on a Windows
Server 2003 cluster,
it is configured as an Exchange Virtual Server that can be
passed between cluster nodes transparently to Exchange
clients.

1. SMTP Virtual Server, 2. HTTP Virtual Server, 3.POP3
Virtual Server, 4. IMAP4 Virtual Server and so on

Answer / udayakumar

To access a network application or resource in a
nonclustered environment, network clients must connect to a
physical server (that is, a specific computer on the
network identified by a unique network name and Internet
protocol (IP) address). If that server fails, access to the
application or resource is impossible.

Through server clusters, Windows Server 2003, Enterprise
Edition and Windows Server 2003, Datacenter Edition enable
the creation of virtual servers. Unlike a physical server,
a virtual server is not associated with a specific computer
and can be failed over like a group. If the node hosting
the virtual server fails, clients can still access its
resources using the same server name.

A virtual server is a group that contains:

A Network Name resource.

An IP Address resource.

All other resources, including applications, to be accessed
by the clients of the virtual server.

Other virtual servers.

exchange server uses protocol virtual server

1.smtp virtual server
2.imap virtual server
3.http virtual server
4.pop3 virtual server

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