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Applies to: Outlook 2013 | Outlook 2016
A default message store is one that client applications can use for general purpose messaging tasks. There are a number of optional features for message store providers that become required if the message store provider is to be used as the default message store. They are as follows:
Implementing the special folders: the Inbox, Outbox, and search-results folders.
Providing read and nonread reports.
Allowing incoming and outgoing message submissions.
Allowing the creation of messages with arbitrary message classes.
Supporting named and multiple-value properties.
Supporting the IMSProvider::SpoolerLogon method, even if the message store provider is tightly coupled with a transport provider.
Supporting associated contents tables. For more information, see Contents Tables.
Supporting notification of the MAPI spooler when there are messages in the outgoing message queue.