A message service is one or more related service providers grouped together for the purpose of simplifying installation and configuration. MAPI recommends that all service providers be included in a message service.
To implement a message service with one or more providers
Design the message service, determining the number and type of service providers to be included. For more information about how to design a message service, see Designing a Message Service.
Create a setup program to install the service providers in the message service. For more information about writing a message service setup program, see Supporting Message Service Installation.