Question: the set value of 0 days will be valid only for newly deleted messages, and the previously deleted ones will still be kept for 14 days?
- I tried to set the value to 0, using MFC MAPI to compare the properties of a message that should be kept in deletions for 14 days and 0 days, but unfortunately there's not any values that work like PR_Retention_Date, only last modification time and message creation time:
So I back to official doc and found something might related: Clean up or delete items from the Recoverable Items folder
When he changes the settings, the Microsoft Exchange Mailbox Assistants service need to be stopped, which might mean if you don't stop the service, those settings changes at once.
All above is just my guess, hope it helps.
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