This study investigates how computer mediated communication (CMC) and the electronic mailing system in particular have impacted on productivity and efficiency not to mention interpersonal interaction and increased use of technology in the organization. An electricity company was chosen for the case study since it had achieved approximately 78% computerization and networking of its office staff. Following the judgemental sampling technique to identify the organization, random sampling was used to select a sample size of 100 respondents. A questionnaire survey with sixteen items was self-administered over a one-week period. The results showed that 73% of the respondents agreed that CMC enhanced their overall productivity and efficiency while 27% differed. However, while the findings revealed that the introduction of CMC increased its use as a whole, it impacted negatively on interpersonal relationships among respondents.