Baidu in China. Yandex in Russia. Google in the US. Not sure for India and Latin America.
The poster was probably thinking of Bing though, which is ironic because it's maybe less used than these.
If we are to believe these stats, Google is at 3% market share in China. It's basically non existent. http://gs.statcounter.com/search-engine-market-share/all/chi...
Microsoft has developers everywhere in the world, who need docs. There are major search engines besides Google and Bing.