A Microsoft unit and two other rivals last year lodged a complaint with the European Union, which is investigating whether Google has violated the region’s antitrust laws. Google is under growing pressure from global regulators that are probing whether the company uses its dominance of Web search to thwart competition.

“Our filing today focuses on a pattern of actions that Google has taken to entrench its dominance in the markets for online search and search advertising to the detriment of European consumers,” Smith wrote in the blog posting.