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Scheduling operations can cause the delivery of a scheduling message into an "Organizer's" or "Attendee's" scheduling Inbox collection. Servers MUST automatically process incoming scheduling messages using the rules defined by [RFC5546], by creating or updating the corresponding scheduling object resources on calendars owned by the owner of the scheduling Inbox collection. In addition, the scheduling message is stored in the scheduling Inbox collection as an indicator to the client that a scheduling operation has taken place. Scheduling messages are typically removed from the scheduling Inbox collection by the client once the calendar user has acknowledged the change.

The server MUST take into account privileges on the scheduling Inbox collection when processing incoming scheduling messages, to determine whether delivery of the scheduling message is allowed. Privileges on calendars containing any matching scheduling object resource are not considered in this case (i.e., a schedule message from another user can cause modifications to resources in calendar collections that the other user would not normally have read or write access to). Additionally, servers MUST take into account any scheduling Inbox collection preconditions (see Section 2.2) when delivering the scheduling message, and MUST take into account the similar preconditions on any calendar collection that contains, or would contain, the corresponding scheduling object resource.

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