Internet e-mail and corporate e-mail

There is no technical difference email that can be used in either a corporate or the Internet environment.

I think your question is regarding the difference between browser accessed email and email client accessed email. The latter typically uses POP3 to retrieve messages from a mail server and SMTP to send messages to a mail server.

Although originally the intent was for SMTP to be like dropping a letter in a mailbox (use any), email abuse has made most SMTP services restricted to subscribers of that server only.

the internet email's use POP3 and a email client to receive and smtp to send and can connect to server through an internet connection. A corporate (such as exchange) uses smtp and you must be on the network to access the server.

I believe that you are asking this in regards to setting up Outlook for the first time. The only difference between the setup options are if you select Internet email, you will not be able to connect to an Exchange Server. If you select Corporate email, you will be able to connect to any type of email server (HTTP, POP3, IMAP)