| Platform SDK: MAPI |
The PR_CONTENT_UNREAD property contains the number of unread messages in a folder, as computed by the message store.
| Header file: | MAPITAGS.H |
| Must be exposed by: | Folder objects |
| May be a column in: | Folder contents tables |
| Must be a column in: | Folder hierarchy tables |
| Identifier: | 0x3603 |
| Property type: | PT_LONG |
| Property tag: | 0x36030003 |
The PR_CONTENT_UNREAD property contains the number of messages in the folder contents table for which the MSGFLAG_READ flag is not set in the PR_MESSAGE_FLAGS property. The PR_CONTENT_COUNT property contains the total message count for the folder. PR_CONTENT_COUNT and PR_CONTENT_UNREAD are read-only to clients.
Some client applications display the heading row of a category differently depending on the value of PR_CONTENT_UNREAD. For example, a client can display a category that includes unread messages in bold. PR_CONTENT_UNREAD cannot be used as a category and an attempt to do so results in the MAPI_E_INVALID_PARAMETER value being returned from the IMAPITable::SortTable method.