The Yahoo attempted takeover springs to mind (mentioned already), and the accusations of copying search results, http://googleblog.blogspot.com.au/2011/02/micr

The Yahoo attempted takeover springs to mind (mentioned already), and the accusations of copying search results, http://googleblog.blogspot.com.au/2011/02/microsofts-bing-uses-google-search.html http://googleblog.blogspot.com.au/2011/02/microsofts-bing-us...