The PR_EXPIRY_NUMBER property contains the number of time units that must pass before an unread message expires.
| Header file: | EDKMDB.H |
| Applies to: | Message objects (information store objects) |
| Identifier: | 0x3fed |
| Property type: | PT_LONG |
| Access: | Read/write |
The PR_EXPIRY_NUMBER property is used for sending messages that expire if they are not read within a certain period. The unread messages no longer exist when the period has expired. If a message with this property is sent to a public folder, it expires immediately.
The information store uses the PR_EXPIRY_NUMBER and PR_EXPIRY_UNITS properties and the MAPI PR_CLIENT_SUBMIT_TIME property to calculate the value of the PR_EXPIRY_TIME property. PR_CLIENT_SUBMIT_TIME and PR_EXPIRY_TIME are standard MAPI properties.
For example:
PR_EXPIRY_TIME = PR_CLIENT_SUBMIT_TIME + (PR_EXPIRY_UNITS + PR_EXPIRY_NUMBER)