swisstopo, the early cloud adopter within the Swiss Public Administration, has started usind cloud services in 2008 and successfully deployed "geo.admin.ch: the Swiss Geoportal" in 2010. The presentation depicts swisstopo's 5 years experience in using cloud services and explains why the "Public Cloud Only" approach has to be extended to an "Open Hybrid Cloud" approach to enable further continued growth and sustainability. On 15th October 2013 geo.admin.ch, the geoportal of the Swiss Confederation has achieved the 2nd place in the EuroCloud Award 2013 in the category of «Best Cloud Service Use Case Public Sector» (the award ceremony took place in the context of the EuroCloud Congress in Luxembourg on October 15th 2013). This award honors the most innovative cloud solution characterized by originality, innovation, creativity and efficiency.