By Tom Fairless in Brussels, and Rolfe Winkler and Alistair Barr in San Francisco 

The European Commission took direct aim at Google Inc. Wednesday, charging the Internet-search giant with skewing results to favor its comparison-shopping service. But the formal complaint may only be the opening salvo in a broader assault that prompts big changes at Google.

European antitrust chief Margrethe Vestager said she continues to examine other domains, such as travel and local services, where Google is accused of favoring its own services over those of others. She also opened a second front, intensifying a separate probe of Google's conduct with its Android mobile-operating system.

If history is a guide, the European case against Google will grow. The bloc's last big case against a U.S. tech firm began with charges against Microsoft Corp. in 2000 related to computer servers. The commission later added charges against Microsoft for bundling its media player, and Web browser, with its Windows operating system.

The charges could lead to billions of euros in fines and requirements for Google to change its business practices. Microsoft ultimately paid EUR2.2 billion ($2.3 billion). But people inside and outside Microsoft say the case also altered the company's culture, making it less brash and more cautious.

"There are certain things you know you can't do that other companies can do," said Jean-François Bellis, a lawyer who represented Microsoft against the EU. Being labeled "dominant," as the EU labeled Google on Wednesday, means executives now must worry about pleasing regulators, as well as users.

Inside Google on Wednesday, "the amount of concern over [antitrust enforcement] is enormous," said one person close to the company.

In a statement posted online, Google said it strongly disagreed with the need to issue formal charges, and it looked forward "to making our case over the weeks ahead."

"While Google may be the most-used search engine, people can now find and access information in numerous different ways--and allegations of harm, for consumers and competitors, have proved to be wide of the mark. In fact, people have more choice than ever before," Google said.

It said there is "a ton of competition" in online shopping from sites such as Amazon.com Inc. and eBay Inc. Google said the traffic, revenue and profits of companies such as Expedia Inc. and TripAdvisor Inc. "tell a different story" than their complaints that Google practices have hurt their businesses.

The complaint marked the first time a regulator has filed formal antitrust charges against Google. U.S. regulators closed their own investigation into Google's search practices two years ago after the company agreed to voluntary changes.

That European regulators decided to move against Google when their U.S. counterparts held back reflects in part the company's higher market share on the continent, but also different legal standards. Unlike the U.S., European antitrust law protects competitors, as well as consumers. And the complaint will initially be argued before the European Commission, rather than a judge.

"If you are dominant in Europe, you have a special responsibility to respect competition," said Ioannis Lianos, a professor of global competition law at University College London. "I think there will be more" charges, he added.

At issue is whether Google uses its overwhelming 90% share of online searches in Europe to squeeze competitors in related markets where it also competes.

The European Commission said Google systematically favors its shopping service, displaying its results in search queries ahead of rival comparison shopping services. The regulator didn't name rivals but companies including Foundem, Nextag Inc. and Twenga SA have complained to the commission about Google's practices.

The narrow complaint, focused exclusively on shopping, was a surprise, following a five-year investigation that touched numerous parts of Google's business. But lawyers said the move may have been tactical.

Limiting the scope means "the commission can bring [the case] to a conclusion more rapidly," said Thomas Vinje, an antitrust lawyer with Clifford Chance who represents a group of complainants against Google.

Ms. Vestager said that a finding that Google violated competition law in comparison shopping "could potentially establish a broader precedent" that would also affect other fields, such as travel websites.

She said the commission continues to investigate the way Google displays search results in other areas where it offers services, such as travel, mapping and local guides. As well, the commission is probing three other Google practices: allegations that Google copies or "scrapes" content from rival sites; the exclusivity of contracts with Web publishers; and advertisers' ability to use competing advertising platforms.

Three previous efforts to settle the case failed, after Google rivals complained that the proposed settlements wouldn't have required significant changes in Google's practices.

At a news conference in Brussels, Ms. Vestager said "every road is open, " including a settlement. But she indicated that any fresh proposal would need to differ substantially from the three earlier attempts.

Google now has about three months to respond to the charges, and could request a hearing before the commission to better explain its case. After that, the EU could immediately impose injunctions requiring Google to stop any behavior deemed anticompetitive, and announce fines. Google could appeal to the EU's appeals courts in Luxembourg, a process that typically takes years, during which time any fines would be held in a separate account. Those courts in Luxembourg have traditionally been sympathetic to the commission.

News Corp, publisher of The Wall Street Journal, on Tuesday joined a group of companies that have filed formal complaints with the commission regarding Google's competition practices, a spokesman said. He declined to disclose further details.

In opening a formal investigation of Android, Ms. Vestager is targeting the operating system that powered roughly 80% of smartphones shipped world-wide in 2014, according to market researcher Strategy Analytics.

The probe focuses in part on concerns that Google effectively forces smartphone makers that use Android to install many of Google's own apps, and to set some, including Google Search, as defaults. Device makers need to use those apps if they want access to other Google services, such as Google Maps or the Play store for apps. Details of those contracts, known as the "Mobile Application Distribution Agreement," were first reported by The Wall Street Journal last year.

Rivals have complained that this makes it hard for them to strike deals for their services on Android smartphones.

Sam Schechner in Paris contributed to this article.

Write to Tom Fairless at tom.fairless@wsj.com, Rolfe Winkler at rolfe.winkler@wsj.com and Alistair Barr at alistair.barr@wsj.com

Access Investor Kit for Amazon.com, Inc.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US0231351067

Access Investor Kit for Expedia, Inc.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US30212P3038

Access Investor Kit for Google, Inc.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US38259P5089

Access Investor Kit for Google, Inc.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US38259P7069

Subscribe to WSJ: http://online.wsj.com?mod=djnwires

News (NASDAQ:NWSA)
Historical Stock Chart
From Mar 2024 to Apr 2024 Click Here for more News Charts.
News (NASDAQ:NWSA)
Historical Stock Chart
From Apr 2023 to Apr 2024 Click Here for more News Charts.