There is a movement to change the computer operating system(OS) from the existing commercial OS to an open OS, which is getting a lot of attention to many organizations. Based on this trend of OS market, this study empirically analyzed the factors affecting the switch to open OS in the public and private sectors. By applying the Push-Pull-Mooring (PPM) framework, which is highly plausible to explain human migration, we examine the factors that cause dissatisfaction with commercial OS and the factors causing attractiveness of alternative of open OS, which positively leads to the organization's intention to switch to an open OS. In addition, as a facilitation factor, the direct and moderating effect of government support on the intention to switch to an open OS were empirically analyzed. Structural equation modeling (SEM) was performed on 249 responses collected from public and private organizations. The results show that all proposed hypotheses were accepted with exception of Technology Quality Limitation, one of Push variables. Findings of the study provide several important implication for researchers and practitioners.