Details
This setting allows you to ensure that items are not permanently deleted until the database has been backed up.
Rationale:
To ensure that accidentally deleted items can be recovered, they should not be permanently deleted until the database is backed up.
Solution
To implement the recommended state, execute the following PowerShell cmdlet:
Set-MailboxDatabase -RetainDeletedItemsUntilBackup $true
Supportive Information
The following resource is also helpful.
This security hardening control applies to the following category of controls within NIST 800-53: Contingency Planning.This control applies to the following type of system Windows.