IMSProvider : IUnknown
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Provides access to a message store provider through a message store provider object. This message store provider object is returned at provider logon by the message store provider's MSProviderInit entry point function. The message store provider object is primarily used by client applications and the MAPI spooler to open message stores.
Message store provider objects
Message store providers
MAPI and the MAPI spooler
MAPI uses one message store provider object per session, no matter how many message stores are opened by the store provider. If a second MAPI session logs on to any open stores, MAPI calls MSProviderInit a second time to create a new message store provider object for that session to use.
A message store provider object must contain the following to operate correctly:
An lpMalloc memory-allocation routine pointer for use by all stores opened by using this provider object.
A linked list of all the stores opened by using this provider object and not yet closed.