SAN FRANCISCO — Microsoft is skewering Google again with ads and regulatory bashing that say as much about the dramatic shift in the technology industry’s competitive landscape as they do about the animosity between the two rivals.

The ads that began last week mark the third phase in a 5-month-old marketing campaign that Microsoft derisively calls “Scroogled.” The ads, which have appeared online, on television and in print, depict Google as a duplicitous company more interested in increasing profits and power than protecting people’s privacy and providing unbiased search results.

This time, Microsoft is vilifying Google for sharing some of the personal information that it gathers about people who buy applications designed to run on smartphones and tablet computers powered by Google’s Android software. Earlier ads have ripped Google’s long-running practice of electronically scanning the contents of people’s Gmail accounts to help sell ads. Other ads attacked a recently introduced policy that requires retailers to pay to appear in the shopping section of Google’s dominant search engine.

“We think we have a better alternative that doesn’t do these kinds of nefarious things,” said Greg Sullivan, Microsoft’s senior manager for Windows Phone, the business taking aim at Google’s distribution of personal information about buyers of Android apps.

As Microsoft attacked Google in the United States, a group led by Microsoft asked European authorities to investigate whether Google has been using its free Android operating system to stifle competition from other mobile services besides its own. One such rival is Microsoft’s Windows Phone system.

The barbs on both sides of the Atlantic could backfire. Even as they help draw attention to Google practices that may prod some consumers to try different services, they also serve as a reminder of Microsoft’s mostly futile — and costly — attempts to trump its rival with more compelling technology.

“It’s always the underdog that does negative advertising like this, and there is no doubt that Microsoft is now the underdog,” said Jonathan Weber, who has been following Microsoft’s “Scroogled” campaign at search consulting firm LunaMetrics.

On the flip side, Google has evolved from an endearing Internet startup to an imposing giant running Web and mobile services that vacuum intimate details about people’s lives. Despite repeated management assurances about respecting personal privacy, Google has experienced several lapses that have resulted in regulatory fines, settlements and scorn around the world.

Beyond privacy, Google has been portrayed as an abusive bully in various complaints about its business practices.

Last week, the Microsoft-led FairSearch group complained that Google has acted unfairly by requiring device makers relying on its Android software to install an entire suite of Google’s mobile services, even if they just wanted one or two apps, such as Google Maps or YouTube. That still hasn’t prevented device makers from redesigning Android to suit their own purposes. Amazon.com Inc., with its Kindle Fire, and Barnes & Noble, with its Nook tablets, are among the companies selling Android products that don’t feature Google services.

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