Microsoft Office Communicator is integrated with Exchange, but doesn't actively "log" chat sessions, you have to email the conversation to yourself. I'd say Lotus SameTime is probably the closest thing I know of that would achieve what you're trying to do.
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Microsoft Office Communicator is integrated with Exchange, but doesn't actively "log" chat sessions, you have to email the conversation to yourself. I'd say Lotus SameTime is probably the closest thing I know of that would achieve what you're trying to do.