Each Reference topic includes a Quick Info table that names the MAPI header file where the API element is defined. The MAPI header files that are commonly used by developers include:
| Header file |
Description of contents |
| MAPI.H |
Definitions of structures, constants, and error values for Simple MAPI |
| MAPICODE.H |
Definitions of status codes for error values |
| MAPIDBG.H |
Definitions of macros for debugging |
| MAPIDEFS.H |
Definitions of commonly used event types, property types, flags, structures, interfaces |
| MAPIFORM.H |
Definitions of forms elements |
| MAPIGUID.H |
Definitions of GUIDs |
| MAPISPI.H |
Definitions of flags and interfaces implemented by MAPI for service providers and message services |
| MAPITAGS.H |
Definitions of property tags |
| MAPIUTIL.H |
Definitions of utility interfaces and functions |
| MAPIVAL.H |
Definitions of validation macros |
| MAPIX.H |
Definitions of flags and interfaces implemented by MAPI for clients |