It's not clear from your question whether or not you are running that service pack on your Exchange server or on your e-mail client, but in either case if you are missing the option to add the Exchange transport to a mail profile on this system, then it sounds like you don't have an Exchange client installed. Windows ships with a stubbed-out minimal version of MAPI. To use Exchange, you need the MAPI DLLs from a full-blown MAPI system (Outlook or Exchange). If you do have Outlook installed on this system, you might want to run its detect and repair process, or re-run setup to make sure that the Exchange messaging components were installed with Outlook.
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