We are still in mixed-mode with Exchange 5.5. We cannot get the DST patch. Will the manual patch be enough?

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Q: We are still in mixed-mode with Exchange 5.5. We cannot get the DST patch. Will the manual patch be enough? We don't have any mailboxes on Exchange 5.5, it only routes.
A: If users are not connecting to this box using CDO (like OWA users) then you don't need the CDO update. You should still look at the guidance in support.microsoft.com/kb/914387 regarding the OS.