In an attempt to control the spread of COVID-19 pandemic in March 2020 the Government of Croatia decided to close all educational institutions in the country and transfer all teaching and learning online. This was a big challenge for organisations and individuals as there was very little time left for the preparation of such transition or for ensuring that everybody involved had access to the necessary infrastructure. In order to document this transfer of the whole education system to online environment CARNET initiated the research focusing on the use of digital technology, particularly in primary and secondary education. While qualitative part of the research involved only a handful of educators who kept reflective journals of their practice during online schooling, nearly 27000 participants responded to the surveys that followed. They reported on challenges with infrastructure, time management, organisation of virtual classrooms, structure of digital materials, student-teacher online communication and other aspects of online schooling. The presentation will briefly report on research results.