Microsoft knows a fair bit about antitrust. It has been the subject of several antitrust probes in the United States and in the EU.
It claims that Google is engaging in anticompetitive behaviour in search, online advertising, and smartphone software.
Writing from his bog, Microsoft general counsel Brad Smith said that while Google has done much to advance its mission to "organize [sic] the world's information", Vole was getting concerned by its broadening pattern of conduct.
He claimed that Vole was joining an army of companies registering their concerns about the state of the European search market.
By the European Commission's own reckoning, Google has about 95 percent of the search market in Europe. In the US Microsoft serves about a quarter of Americans' search needs either directly through Bing or through its partnership with Yahoo, Smith said.
Smith said that the complaint 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 punters.
He said that Google has built its business on indexing and displaying "snippets of other organisations' Web content". Google has engaged in a "broadening pattern of walling off access to content and data that competitors need to provide search results to consumers and to attract advertisers," he said.