The public administration of the Swiss canton Aargau chose to use OSS for the publication of all open WMS, using GeoServer-Cloud and PostgreSQL. Meanwhile, the decentral offices, which gather geographical data and style this data are used to using proprietary software for this purpose. The strategy chosen was to provide a soft transition to OSS, by providing automated conversion processes based on a new FOSS project and by improving existing OSS with regards to styling conversions towards SLD.