Specifies a default calendar for an "Attendee" where new scheduling object resources are created.
This property MAY be protected in the case where a server does not support changing the default calendar, or does not support a default calendar.
COPY/MOVE behavior: This property is only defined on a scheduling Inbox collection that cannot be moved or copied.
Description: This property MAY be defined on a scheduling Inbox collection. If present, it contains zero or one DAV:href XML elements. When a DAV:href element is present, its value indicates a URL to a calendar collection that is used as the default calendar. When no DAV:href element is present, it indicates that there is no default calendar. In the absence of this property, there is no default calendar. When there is no default calendar, the server is free to choose the calendar in which a new scheduling object resource is created. See Section 4.3.