Microsoft Exchange Server MAPI Editor (MFCMAPI) is now hosted on CodePlex. Visit the MFCMAPI
page on CodePlex at http://MFCMAPI.codeplex.com.
MFCMAPI uses Microsoft’s published APIs to provide access to MAPI stores through a graphical user interface. Its purpose is to facilitate investigation of Exchange and Outlook issues and to provide developers with a canonical sample for MAPI development.
For more information and a list of features, please read A Brief History Of MFCMAPI.