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Ending a MAPI Session

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Applies to: Outlook 2013 | Outlook 2016

Clients can end their sessions in response to a user's request, either immediately or after all outbound messages have been processed, and when a critical error occurs. Some clients need to stay logged on so that pending outbound messages can reach the transport provider and the destination messaging system. If such a client sends a message and immediately logs off, the message may remain in the outgoing queue until a user logs back on and stays logged on long enough for the message to be transmitted.

When you need to terminate your session with the MAPI subsystem

  1. Cancel the registrations for all notifications by calling the Unadvise method of every registered object.

  2. Release all open objects by calling their IUnknown::Release methods. The types of open objects can include advise sinks, the status table, the Outbox folder, one or more message stores, and the address book.

  3. Call MAPIFreeBuffer to free the memory for any cached entry identifiers, such as PR_IPM_SUBTREE_ENTRYID (PidTagIpmSubtreeEntryId).

  4. Call IMAPISession::Logoff, setting the MAPI_LOGOFF_UI flag if you allow a user interface and the MAPI_LOGOFF_SHARED flag if you own the current shared session. Logoff notifies all other clients that are using the current shared session that they should log off by sending an error notification.

  5. Release the session pointer by calling the session's IUnknown::Release method.

  6. If you called OleInitialize during session startup to initialize the OLE libraries, uninitialize them now by calling OleUninitialize. Only clients that have called OleInitialize must call OleUninitialize.

  7. Uninitialize the MAPI libraries by calling MAPIUninitialize. If you called OleInitialize at some point, make sure that a call to OleUninitialize occurs before this call to MAPIUninitialize. The timing is crucial. If the call to OleUninitialize follows the call to MAPIUninitialize, your client might terminate ungracefully.

  8. If you called ScInitMapiUtil during session startup to initialize the MAPI utility library, uninitialize it now by calling DeinitMapiUtil. Only clients that have called ScInitMapiUtil must call DeinitMapiUtil.

Note

All open objects must be released before the call to IMAPISession::Logoff. Objects that remain open after Logoff is called become invalid; they cannot accept any calls and might never be freed. If a call is made to one of these objects, expect the call to fail.

MAPI has no mechanism for deleting DLLs during the session shutdown process. A service provider's DLL can only be deleted when a configuration client such as the Control Panel calls its message service entry point function with the MSG_SERVICE_INSTALL event.