National Land Survey of Finland has used GeoNetwork for more than a decade to provide spatial data and service providers in Finland a platform for maintenance of their metadata. More than a hundred user groups have described spatial data sets and services in the metadata catalogue, which is called Paikkatietohakemisto. The metadata published are widely reused in other web sites and services, such as opendata.fi. If you want to learn from our experiences, come and listen to this presentation during which we'll tell you: - How we managed to transfer from one INSPIRE metadata standard to another in co-operation with data providers and - How we by summer 2024 managed to transfer from GN version 3.12 to 4, summarising the challenges and opportunities we faced.