The European Commission's Open Source Observatory (OSOR) will showcase its latest initiative, the OSOR Handbook—a practical guide designed to support public administrations in adopting and effectively using open source software. Following the publication of the handbook's initial version in early 2024, a community consultation was launched to gather insights and feedback from the OSOR network. This process informed a revised edition of the handbook, highlighting the diverse needs of public administrations across Europe. These knowledge-sharing efforts are essential to foster collaboration among governments, as they help provide the necessary competences for government to collaborate.