Was it not China that opted for Linux systems for their government?
I believe that many governments have discussed promoting open source, and at least some are moving in that direction. In particular, in East Asia, I believe that China, Japan, and South Korea have all voiced at least a modicum of official support for migrating to open source. From METI:
The establishment of the Japan Open Source Software Promotion Forum was announced on Nov. 14, 2003 at the “Japan-China-Korea Open Source Business Talks,” an international symposium held in the City of Osaka, and hosted by Japan Information Technology Services Industry Association (JISA; Mr. Yujiro Sato, Chairman); participating in the event were Japanese information systems users, vendors, and academics.
The forum will bring together Japanese information systems users, vendors, and academics, and will foster the open debate of issues related to OSS, as well as ways of resolving problems that arise.
There is also information about Japanese official thinking on open source here.