PidTagImportance Canonical Property
Applies to: Outlook 2013 | Outlook 2016
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:
The message has low importance.
The message has high importance.
The message has normal importance.
Provides references to related Exchange Server protocol specifications.
Handles message and attachment objects.
Provides data type definitions.
Contains definitions of properties listed as alternate names.