MAPIViewer

MAPIViewer is a FREE simple to use Windows NT/2000/XP utility that provides an Explorer-like interface for browsing MAPI stores accessible via the win32 MAPI API's.

If you are working with the MAPI api's then this is a MUST HAVE utility for viewing MAPI stores, folders, and message item properties, and hierarchy.
MAPI commands called by MAPIViewer are now visible on the bottom portion of the database browser.