Shaddows - 1:38 pm on Mar 31, 2011 (gmt 0)

According to the BBC [bbc.co.uk], the reason isnt so much dominance as abuse of position.

The software maker claims that Google used its dominant position in the search market to restrict the growth of Microsoft services. It cites a number of practices, including Google limiting the ability of Microsoft Bing to index web content.

From the blog post referenced by the OP, the BBC summarises 5 areas of concern:

- Using technical measures to stop Microsoft's search engine Bing from indexing content on Google-owned YouTube. - Blocking Microsoft Smartphones from operating properly with YouTube. - Controlling access to online copies of out-of-copyright books. - Limiting the ability of businesses to reclaim "their own information" generated through Google advertising campaigns for use elsewhere. - Compelling leading websites to only use Google search boxes on their pages.