This paper is devoted to the modeling a collaboration portal architecture and its implementation for the field of environmental initiatives. Given the modern trends in cloud services development, special attention is paid to the modeling capabilities of Microsoft 365 ecosystem. A conceptual, formalized and program models of the collaboration portal for effective support of coordinated work the participants of Erasmus + project from different regions and organizations is proposed. The key structural components of portal that provide flexibility, scalability and security in the process of information exchange and coordination withing project are identified. The performance of the involved modeling techniques is demonstrated both on the realized examples of knowledge sharing, collective decision making, project management and on evaluating the portal effectiveness with using of internal resources of Microsoft 365. In addition, the paper identifies areas for further development of the portal's functionality, focusing on the integration with the model-driven applications that will contribute to the friendliness and sustainable cooperation.