Exchange 2000 expands the routing capabilities of Microsoft
Internet Information Services (IIS) to allow
secure collaboration between Information Store and remote clients
through various protocols. Exchange supports clients that use the
following protocols:
Hypertext Transfer Protocol
(HTTP). Exchange has native support for HTTP
version 1.1, an Internet standard that provides access for Web
browsers and other services. More...
Network News Transfer Protocol
(NNTP). NNTP enables Microsoft Outlook users to
participate in online discussions over the Internet. Exchange also
enables users running client applications that support NNTP to
access newsgroup public folders that are available on Exchange
servers. More...
Post Office Protocol version 3
(POP3). POP3, designed primarily for offline use, is
used to retrieve messages from a server. More...
Simple Mail Transfer Protocol
(SMTP).  SMTP serves two functions in Exchange 2000.
It is the native protocol for e-mail submission and the native
transport protocol. More...
You may experience specific problems when attempting to manage
your messaging clients; for example, your clients may have
difficulty establishing a connection to the computer on which the
protocol service is running or you may experience problems with
client protocol services, such as the NNTP service failing to
start.
To identify and resolve specific problems that can occur when
managing messaging clients, see Common
Issues.
Another type of messaging client is the International Outlook
language client. If users of this client cannot create a profile
and logon to a mailbox, you will need to add language support.