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.