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Several information systems and computer-mediated communication studies in the literature measure user's perceptions of E-mail. The user's perceptions of E-mail were used to develop and validate the Technology Acceptance Model (TAM). While a user's perceptions of E-mail play an important role in the literature, very few studies have focused solely on developing a construct for measuring these perceptions. In this paper, we develop a construct to measure an individual's perceptions of E-mail as a medium for electronic communication in organizations. Using a survey of management and nonmanagement employees in northeastern USA, we empirically test our theoretical construct. The results of our research indicate that an individual's perceptions of E-mail are a multidimensional construct with two dimensions: the individual level dimension and the organizational level. At an individual level, a person's perceptions may be impacted by E-mail's role in improving productivity, supporting team work, and providing global reach. At an organizational level a person's perceptions may be impacted by E-mail's role in making an organization vulnerable to viruses, exposing proprietary information, and/or encouraging unprofessional and illegal behavior.