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Microsoft Exchange Server supports several Internet protocols. An Internet protocol is a set of standards designed to enable different types of computers to communicate with one another and to exchange information through the Internet.
| Component | Description | 
|---|---|
| Network News Transfer Protocol (NNTP) | Enables clients to read and post information to USENET newsgroups. | 
| Post Office Protocol version 3 (POP3) | Enables users with POP3 clients to retrieve mail from their Microsoft Exchange Server Inbox. | 
| Internet Message Access Protocol, Version 4rev1 (IMAP4rev1) | Enables IMAP clients to access messages stored within a user's private and public folders on a Microsoft Exchange Server computer. | 
| Lightweight Directory Access Protocol (LDAP) | Enables LDAP clients to access directory information from the Microsoft Exchange Server directory. | 
| Hypertext Transfer Protocol (HTTP) | A method that World Wide Web servers use to send Hypertext Markup Language (HTML) pages over the Internet for display by a Web browser. |