TJ Spyke said:
Europe number from this
http://www.next-gen.biz/index.php?option=com_content&task=view&id=5228&Itemid=2 (the same report announcing Wii had hit 2 million in Japan and 6.5 million worldwide)
That article is from April 13, as you previously said.
Nintendo shipped 5.8-5.9 million (5.86?) by March 31, 2007. By April 13, the Wii was at 2 million in Japan. March NPD had not been released, though (released on April 19th). By February NPD, Wii was at 1.85 million in U.S. (2 million for U.S. + Canada).
In short, it looks like the article was using a questionable shipment number (6.5 million), correct Japanese sales, guessed (ioi, maybe?) NA sales through March, and then a calculated Europe number based on their questionable shipment number and the guessed NA total.
Here's a press release from June 21.
http://www.gamesindustry.biz/content_page.php?aid=25992
The unprecedented success of the Nintendo DS has helped to expand the gaming audience more than ever before and is the fastest selling console to reach the 10 million mark in European history, now with sales of almost 12 million, while the newly released Wii has already sold approximately 2 million in Europe since launch.