By Alistair Barr 

Google Inc. built one of the world's most powerful networks of data centers, able to handle more than three billion search queries a day. But it fell behind Amazon.com Inc. in the fast-growing business of renting out computing horsepower to others.

Now, Google is making a renewed effort to catch Amazon. At a conference on Tuesday, Google will highlight new offerings that make it easier for customers to set up so-called cloud services more quickly.

Google executives say they've learned from past mistakes and are adapting the company's offerings. It will be a tough sell.

"Five years ago, when we were starting, Google's service didn't really exist and Amazon was the only complete option," said Adam D'Amico, director of technical operations at Okta Inc., an identity-management startup that runs its business on Amazon's computers. The company is considering Google as a backup. "Google is the second-place contender now," he added.

Amazon started renting computing power in 2006, in a unit known as Amazon Web Services. Google unveiled its offering two years later. But Google initially required customers to write software similar to the way Google does. Amazon's more flexible approach proved more popular. It used so-called virtual machines that let developers use most popular programming languages, databases and other tools. Google adopted this approach later, but by then it had ceded the early lead.

Chris Pinkham, a former Amazon executive who founded cloud-management startup Nimbula Inc., said Google executives didn't initially see the potential of renting computer power to others.

In early 2009, Mr. Pinkham said he met with Google executives to discuss working with Nimbula to compete against Amazon. "Their answer was 'Why,' " he said. "They weren't convinced that this was a real business." He declined to name the Google executives.

Greg DeMichillie, director of product management at Google Cloud Platform, said the company never questioned the value of renting out its servers. But he said Google initially was focused on building enough data centers to run its own services, such as the search engine.

He says Google can still catch Amazon. "As early as 2008 was, 2014 it turns out is actually still pretty early," he said.

Amazon is the clear leader in the field, providing most cloud-computing units and collecting about one-third of the revenue, according to estimates from research firm Gartner, which places Microsoft Corp.'s Azure second and Google third. Gartner says the market for renting computing resources will grow 35% a year to $42 billion by 2018, from $9.2 billion last year.

Hurdles for Google include the cost and complexity of switching providers. Cloud users say the larger, more developed ecosystem of consultants and developers around Amazon's offerings is a big advantage.

Amazon's offering has been around longer and "has benefited from tons of feedback over the last five-plus years," said Javier Soltero, founder of enterprise email startup Acompli Inc. "That gap can be narrowed over time, but Amazon truly has a significant lead here."

Google's big technical move came last year, when it fully launched Compute Engine, a more flexible service similar to Amazon's.

Netflix Inc., a big Amazon customer, started using Google's cloud-storage service late last year. A company spokesman said Netflix has no plans to replace Amazon for its core cloud computing.

Google has won some switchers. Allthecooks LLC moved its recipe-sharing website and mobile apps to Google's cloud about three years ago. The shift was difficult initially, but a good move over the longer term, said Rafael Sanches, founder of Allthecooks. He said Google's more recent changes will make it easier and cheaper for the site to show recipes to users searching on its website or apps.

German mobile-app developer Grandcentrix GmbH switched to Google about two years ago. Ralf Rottmann, the company's chief technical officer, said Google's servers respond more quickly and allow Grandcentrix to tap additional computers more quickly than Amazon.

But Mr. Rottmann said Google remains weak on administrative tasks like billing. He said it took Google more than two weeks to find a recent project so Grandcentrix could pay. Google traditionally focused on engineering, rather than product management or marketing, he said.

"This is a major problem," Mr. Rottmann said. Amazon and others "have sorted these things out."

Mr. DeMichillie said Google is working on new developer tools, including billing. A Google spokesman declined additional comment.

Early on, cloud computing wasn't considered a top priority inside Google or staffed with the best engineers, who tended to work on the core advertising business or advanced projects, according to two people familiar with company's efforts in this area.

Google's data centers were custom built to process search queries efficiently. That meant software and apps had to be written differently than the norm outside Google.

Google's first cloud service, App Engine, used the company's internal approach. In contrast, Amazon used more standard technology.

Google adopted virtual-machine technology for Compute Engine. That posed another problem because the best Google engineers weren't interested in a project akin to "going back in time," according to one of the people familiar with the situation. The project was technically difficult, but not in an interesting way, causing turmoil within Google, the two people added.

Write to Alistair Barr at alistair.barr@wsj.com

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