PidTagImportance Canonical Property
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Contains a value that indicates the message sender's opinion of the importance of a message.
This property and the PR_PRIORITY (PidTagPriority) property should not be confused. Importance indicates a value to users, while priority indicates the order or speed at which the message should be sent by the messaging system software. Higher priority usually indicates a higher cost. Higher importance usually is associated with a different display by the user interface.
This property can have exactly one of the following values: