MAPI is a mature mechanism to access information in Microsoft Exchange Server. Use MAPI to access items and folders within public and private stores and the properties stored with each item. Client applications use MAPI to access user mailbox and public folder information stored in Microsoft Exchange Server and user directory information stored in Active Directory. Client applications using MAPI are typically the email clients and applications that require complex email processing.
You can retrieve emails and contact details from the Outlook PST files and Microsoft Exchange Server using MAPI only when the PowerCenter Integration Service is running on Windows.