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Keep local temp files cleaned out.
If you run in an environment with a lot of integrated applications (Document Management System, etc.) keeping the C:\Documents and Settings\userID\Local Settings\temp folder cleaned out when using Exchange really helps as well. Not to mention the cached files under Local Settings\Temporary Internet Files (Content.IE5, Content.Word, Content.Outlook). Outlook and Word both write files out there and if it's not kept clean, can seriously impact the speed of the OS (XP).