SQL Mail is a Mail Application Programming Interface (MAPI) based application that requires the MAPI messaging subsystem in order to send mail. A MAPI subsystem is installed when you install a MAPI-based client. Microsoft Windows NT 4.0 provides a MAPI client named Windows Messaging; however, Microsoft Windows 2000 does not provide a MAPI client. The easiest way to provide the MAPI subsystem for SQL Mail to use is to install a MAPI-based mail client such as Microsoft Outlook. The mail client also provides a mechanism for you to configure a mail profile that you can then assign to SQL Mail. The mail profile provides SQL Mail with the information it needs to connect to the mail server to send and receive mail.