Does MessageStats have the abillity to verify existing Mailbox Delegates to ensure they are valid?
E.g. A Mailbox Delegate was set in Exchange. The Mailbox Delegate was removed unexpectedly and the Active Directory account was deleted, causing an invalid delegate.
No, MessageStats does not have the abillity to retrieve or verify this information. Currently, MessageStats gathers information about what name has been assigned to the delegate. It can not go back in time about delegate information it has already gathered and verify it. If the delegate does not exist, or the AD account was deleted, this information will not be displayed in a report.
Enhancement Request TF00194248 has been submitted to Development for possible consideration in a future release of MessageStats.