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Consider the following scenario:
A Microsoft Exchange Server 2007 server receives an iCalendar meeting request message over an SMTP server.
The meeting request is delivered over a receive connector. The Externally Secured authentication method is selected on the receive connector.
The From address on the meeting request matches and resolves to a user or to a contact object that exists in the Active Directory directory service.
In this scenario, the reminder is triggered earlier than expected.
This problem occurs because the iCalendar body part in the message that is received from an SMTP server does not specify a VALARM property. Therefore, Exchange Server 2007 does not cause the reminder to remain in the calendar appointment when the request is processed by the calendar assistant. This condition causes the default reminder to occur within 15 minutes of receipt.
To resolve this problem, install Update Rollup 4 for Exchange Server 2007 Service Pack 1 (SP1). For more information about Update Rollup 4 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: