Exchange Internet Protocol Access Components

Posted: July 19, 2011 in Exchange Server, System Information

Exchange Server 2003 comes with a set of four Internet protocol services. These let you extend the reach of Exchange users beyond Microsoft’s very good, but proprietary, electronic messaging protocol MAPI. The four services are Hypertext Transmission Protocol (HTTP), which supports Outlook Web Access (OWA); Post Office Protocol (POP3); Internet Message Access Protocol (IMAP4); and Network News Transfer Protocol (NNTP):


HTTP:  HTTP is the core protocol that supports web access. OWA uses the HTTP protocol to give users access to everything in their Exchange mailboxes, as well as items in public folders, using a web browser such as Microsoft Internet Explorer. On the server side, OWA is supported by Windows Server 2003s Internet Information Server.


POP3 Server:  Exchange Servers POP3 server gives users with standard POP3 e−mail clients, such as Eudora or Outlook Express, limited access to their Exchange mailboxes. Users can download mail from their Exchange Inboxes, but that’s all. Users have no direct access to other personal or public information stores or to their schedules. This is due to limitations in the POP3 protocol itself, not in Microsoft’s implementation of the protocol.


IMAP4 Server:  The Exchange IMAP4 server goes one better than POP3, adding access to folders in addition to the Exchange Inbox. With IMAP4, folders and their contents can remain on the Exchange server, be downloaded to the computer running your IMAP4 client, or both. You can keep Exchange Server based folders and their contents in sync with the folders on an IMAP4 client.


NNTP Server:  The NNTP server lets you bring all those exciting Usenet newsgroups into your Exchange servers public folders, where your users can read and respond to them with the same e− mail clients that they use to read other public folders.


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