IIS Log files / OWA / Windows Mobile IIS Log Processor task warnings: "Unable to find a mailbox in the MessageStats database that corresponds with the user account"
E.g. Unable to find a mailbox in the MessageStats database that corresponds with the user account '<domain\useraccount>'.
or
Unable to resolve the user <domain\useraccount> with Device ID <DeviceID> into a known mailbox.
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