| Acronym | Definition |
|---|
| MAPI | Messaging Application Programming Interface |
| MAPI | Maharishi Ayurveda Products International (Fairfield, IA; health supplements) |
| MAPI | Management Api |
| MAPI | Mail Api |
| MAPI | Mobile Api |
| MAPI | Millon Adolescent Personality Inventory |
| MAPI | Mail Application Program Interface (Microsoft) |
| MAPI | Mitsubishi Atomic Power Industries (Japan) |
| MAPI | Manufacturers Alliance for Productivity and Innovation (Arlington, Virginia) |
| MAPI | Missouri Association of Private Investigators |
| MAPI | Mid-Atlantic Paranormal Investigations (Martinsburg, WV) |
| MAPI | Mobilisation autour d'un Projet d'Insertion (French: Mobilization around an Integration Project) |