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Of all the potential sources of digital evidence, e-mail is one of the best. People often draft and send e-mail that they assume will never be read by anyone other than the intended recipient. As such, these often candid exchanges can (and have) come back to haunt the parties involved. It's also persistent, residing in multiple locations, thus making it harder to get rid of.
E-mail is accessed and managed in one of two ways. The first is web-based e-mail such as Google's Gmail or Microsoft's Hotmail. These tools function through a web browser. The second is through an e-mail application (client). E-mail clients are specialized programs designed specifically for working with e-mail. Some applications also manage calendars, tasks, contacts, and more. Outlook and Windows Live Mail by Microsoft are two of the most popular e-mail clients on Windows systems. Outlook, the more robust of the two, is used primarily in the workplace or by power users. Windows Live Mail and its predecessor Outlook Express have much more limited functionality.