Understanding the Types of Mail Accounts
Outlook supports a variety of messaging protocols. A protocol is a method of transferring messages between the messaging server and the messaging client. In some cases, your ISP or messaging server might support more than one possible protocol. To choose the protocol that's right for you, make sure that you understand the various protocols and what they can do for you. If you're in an Exchange environment, your system administrator determines which protocols you can choose to access your mail server.
POP3
One of the most popular protocols is POP3 (Post Office Protocol Version 3). Strangely enough, you don't actually ever hear about Post Office Protocol Version 1 or 2, but they were both used at one time ...
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