MAPI Properties

Description: Contains a value that indicates the message sender's opinion of the importance of a message.
Property ID: $0017
Property type: PT_LONG
Area: General messaging

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:
IMPORTANCE_LOW - The message has low importance.
IMPORTANCE_HIGH - The message has high importance.
IMPORTANCE_NORMAL - The message has normal importance.