Using Microsoft technologies, you can insert, edit, query, and delete database entries using any e-mail client such as Hotmail, Outlook, Yahoo, or even WAP phone. While e-mail is certainly a powerful and widely used tool, it is usually not integrated with an application for performing any tasks other than sending reminders. The application scenario described here, an e-mail-based SQL update program, uses a simple data model; however, this solution will apply to any data model that you are working with.
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SQL and Outlook: Enable Database Access and Updates Through Exchange and Any E-mail Client