Original: The WiiWare service was officially launched on March 25, 2008, in Japan, on May 12, 2008, in North America, and on May 20, 2008, in the PAL\/UK regions.
Simplified: WiiWare was first available in Japan on March 25, 2008, then in North America on May 12, 2008, and in Europe and Australia on May 19, 2008.