Microsoft Outlook 2000 has three different installation options. These are "Internet Only," "Corporate or Workgroup," and "No E-mail." This article describes the major differences in these options to assist you in deciding which is best for you.

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Outlook Setup will attempt to detect whether you should be using Internet Only, or Corporate or Workgroup support and install the correct option. For example, if you upgrade from Outlook Express, Outlook will automatically default to Internet Only. If you upgrade from Microsoft Exchange Server, Outlook will automatically default to Corporate or Workgroup.

To bypass the automatic detection and select your e-mail preference, follow these steps:

1.	In E-mail Options, click "None of the above" and then click Next.
2.	In the E-mail Service Options, click to select Internet Only, Corporate or Workgroup, or No E-mail.

You can change the selected option after installation. To change the option, on the Tools menu, click Options. On the Mail Delivery tab, click Reconfigure Mail Support.

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Internet Only Option

You should use the Internet Only option if:

You send and receive all your e-mail through an Internet Service Provider (ISP) or e-mail server.

These ISPs or servers use Internet standards such as, Post Office Protocol 3 (POP3), Simple Mail Transfer Protocol (SMTP), or Internet Message Access Protocol (IMAP) for e-mail delivery. You may also send and receive faxes but don't use any other programs which need to install Messaging Application Programming Interface (MAPI) services, such as a Voice Mail service.

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Corporate or Workgroup Option

You should use the Corporate or Workgroup option if:

•	You use Microsoft Exchange Server, Microsoft Mail, or a third party MAPI e-mail service (such as cc:Mail) as your primary mail transport. You may also use an ISP.
•	You send and receive all your mail through an ISP, but you use other programs requiring the installation of the MAPI services, for example, a Voice Mail service.

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No E-mail Option

You should use the No E-mail option if:

You use only the Personal Information Management (PIM) features of Outlook, such as tracking your appointments and tasks and storing name and address information.

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What Is MAPI (Messaging Application Programming Interface)

An Application Programming Interface (API) is a system of instructions that allows various programs to connect with each other. MAPI permits different e-mail programs to work together to handle messages.

Much of Windows-based software functions around APIs. These are standardized sets of instructions that software developers can call upon to complete certain tasks. For example, an API can handle such things as hanging up your telephone once your modem is finished using the phone line.

MAPI was developed to allow all types of e-mail to be exchanged. Developers of numerous e-mail programs have employed MAPI to permit their programs to communicate with each other without any incompatibility problems.

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