Queue created when the MSMQ MAPI Transport Provider is started the first time. The transport provider creates a user input queue for each MAPI user. Each queue is created with an enterprise scope, its type property set to the MAPI type identifier shown in the following example, and its label set to a MAPI user's logon name.
MAPI type identifier:
{5EADC0D0-7182-11CF-A8FF-0020AFB8FB50}
An MSMQ mail message that reaches any of these queues is picked up by the MSMQ MAPI Transport Provider, translated into an e-mail message, and sent to the Inbox of the MAPI application.