PidTagContentCount Canonical Property

Applies to: Outlook 2013 | Outlook 2016

Contains the number of messages in a folder, as computed by the message store.

Associated properties:
Data type:


This property computed by the message store is used for two different, though related, purposes. On a MapiFolder object, it contains the number of messages in a folder. In a heading row in categorized MAPI tables, it contains the number of non-associated messages in the category corresponding to that heading row.

The number contained in this property does not include associated entries in the folder. PR_CONTENT_UNREAD (PidTagContentUnreadCount) contains the count of unread messages for the folder. A client application can read but not change this property and PR_CONTENT_UNREAD.

Protocol specifications


Provides references to related Microsoft Exchange Server protocol specifications.


Handles folder operations.


Includes permissible operations for the core table objects.

Header files


Provides data type definitions.


Contains definitions of properties listed as alternate names.

See also

MAPI Properties

MAPI Canonical Properties

Mapping Canonical Property Names to MAPI Names

Mapping MAPI Names to Canonical Property Names