Messaging API (MAPI) is a set of APIs and DLLs that provides a common interface for creating and accessing diverse messaging applications and systems. The MAPI subsystem interacts between front-end applications and back-end messaging systems. MAPI supports various back-end systems by separating the client interface from the messaging systems and ensuring each component works with a common Windows interface.

1. Messaging API(MAPI)

2. Messaging API (MAPI)
 Messaging API is a composition of common Application
Programming Interface (API) and dynamic-link libraries (
dll ).
 Interface is used to create and access diverse
messaging applications and messaging
systems, providing true independence for both.
 dll contains MAPI sub system, which interacts between
the front-end messaging applications and Back-end
messaging system.

3. Features & Overview
 It is an pen programming interface.
 Developers can use this interface and customize it as they
want to use it like word processing application or work group
application.
 MAPI provides separation between the programming
interface used by front-end client applications and back-end
messaging systems.
 So that it can support various messaging systems.
 Every component works with a common Microsoft Windows–
based user interface.

4. MAPI Architecture

5. MAPI Address Book Provider
 MAPI Address Book Provider handle access to directory
information.
 Directory information consists of data for 2 types of
message recipients:
a)Individual Messaging users
b) group of messaging users.

6. MAPI Message store Provider
 Message store providers
handle the storage and
retrieval of messages and
other information for the
users of client applications.
 Message information is
stored in hierarchical
system known as Message
Store in multiple levels,
with containers called
folders and sub folders.

7. MAPI Transport Provider Overview
 Transport providers handle message transmission and
reception and implement security, if necessary.
 Client applications communicate with the transport
provider through a message store provider.
 When a message is ready to be sent, MAPI must
determine which transport provider should handle the
transmission.
 This checks the security permission (valid credentials)
before sending it to recipient, to avoid security issues

8. MAPI Message Service Overview
 Message services perform the work of interfacing between
the user and service providers that work with a common
messaging system.
 Message service completely handles the installation and
configuration of each of the service providers that belong to
the service.
 When a message service is installed, its installation program
copies necessary files from the installation source to the
user's local disk and updates a configuration file.
 This file contains list of service providers installed in local
machine and links to the providers in hierarchical system.

9. MAPI Message Service Overview