It seems the Netherlands Patent Office and the Netherlands Competition Authority are migrating to free software:
http://ec.europa.eu/idabc/en/document/7222/469
And there's an organisation called "OSOSS" who are trying to help public administration migrate to open standards and free software:
http://ec.europa.eu/idabc/en/document/7218/470
BTW, although their "open source" terminology is regrettable, the IDABC Open Source Observatory produce useful reports about free software migrations: http://ec.europa.eu/idabc/en/chapter/470