Don't know specifically about Europe-wide or Netherlands specific, but it's not unheard of in various European countries.

As an example, the city government of Barcelona started to migrate things away from proprietary systems back in 2017. First applications and later the OS itself. Not sure what the progress of that is though. Old article about it: https://elpais.com/ccaa/2017/12/01/catalunya/1512145439_1325...

Similar moves been done in various agencies and entities in France and Germany as well.