Information and Communication Technology (ICT)-supported learning using free and open source platform draws little attention as open source initiatives were focused in secondary or tertiary educations. This study investigates possibilities of ICT-supported learning using open source platform for primary educations. The data of this study is taken from a 3-years ICT-supported education quality enhancement project involving 300 elementary schools and 200 junior high schools in the Special Province of Yogyakarta, Indonesia. In this research, 50 elementary and 50 junior high schools are used as samples for pilot observation. Technology Acceptance Model and Structural Equation Model are employed to analyze the findings. It is concluded that open source platform is accepted even in a low e-readiness environment such as in primary educations. Further, this research also develops strategies to successfully implement open source platform for ICT-supported learning in primary educations. However real e-learning outcome is not yet measured as this study is performed before the national exam of the participating students performed.