By Shira Ovide 

Microsoft Corp. tried for years to crack the mobile market, developing its own software, its own handsets and spending billions of dollars to acquire a company to unite the two. On Wednesday, the Redmond, Wash., giant acknowledged it needs a new formula.

The admission was a harsh one for its investors and employees: It is writing down about 80% of the $9.4 billion deal for Nokia's handset business and patents, and will cut up to 6.6% of its global workforce--mostly in its mobile business--a year after an earlier round of job cuts to the business.

The twin blows are an embarrassing reminder of Microsoft's inability to find a foothold in the smartphone industry after a more than a decade of strategy zigzags and billions of dollars of investment. The trends that put a personal computer in nearly every pocket or purse, more than any other technological shift in the past decade, have eroded Microsoft's former position at the center of computing.

A Microsoft spokesman declined to comment.

Chief Executive Satya Nadella, who disclosed the moves in an email to employees, has won high marks inside and outside Microsoft during his first 17 months on the job for bucking long-standing traditions and proliferating the company's software beyond its Windows operating system. But he also has presided over two rounds of widespread layoffs, and the company's mobile hardware business has been no better off under his watch.

Microsoft was among the early entrants in the mobile business with phone software dating back to the 1990s. But its fortunes sagged as the industry shifted toward consumer-friendly phones from companies like BlackBerry Ltd. and especially Apple Inc. Mr. Nadella's immediate predecessor Steve Ballmer famously dismissed the iPhone in its early days for its high cost and lack of a keyboard. Since then, the company several times overhauled its mobile executive team, and revamped its operating software for mobile phones. Each time, Microsoft said the changes would improve sales of Windows smartphones. They didn't.

Mr. Ballmer in 2013 decided Microsoft had to do more than license its smartphone operating software to independent hardware makers, as it licensed Windows to personal-computing partners including Dell Inc. Mr. Ballmer later cast the Nokia deal as a way to control both the software and the hardware for smartphones, as Apple does.

"We've evolved our thinking," Mr. Ballmer said when he unveiled Nokia deal in September 2013. He said Microsoft would "blaze the trails here with our own first-party hardware."

Mr. Nadella hasn't made that promise pay off. Fewer than three of every 100 new smartphones sold world-wide bear Microsoft's brand, according to research firm IDC, a bit less than the company's market share at the same point in 2013. Meanwhile, Apple and phone makers like Samsung Electronics Co. that use Google Inc.'s Android software have solidified their grip on the smartphone market.

Microsoft's losses on its homegrown phones have increased. In the three months ended March 31, it lost an average 12 cents on each phone it built, before those devices even left the factory floor. Microsoft fans have complained the company hasn't released for many months a new model of high-end smartphone that competes with the iPhone. Mr. Nadella has promised one before the holidays.

For now, the continuing struggles in Microsoft's smartphone business have forced Mr. Nadella to address questions of whether the company would be better off dumping its mobile-phone operation altogether.

"It is important for us to be in the handset market," Mr. Nadella said at an April event in response to an analyst's question about whether Microsoft should continue to make smartphones. His email to employees restated the commitment to the company's homegrown mobile business.

Mr. Nadella also acknowledged that Microsoft would revamp its smartphone strategy, though he was light on the details. "We'll run a more effective and focused phone portfolio business while retaining capability for long-term reinvention in mobility," he said in a statement.

Microsoft is likely to pare back the number of phone models it makes, retreat from selling phones in some countries and reduce the number of cellphone carriers it works with, according to a person familiar with the company's plans. Microsoft's own manufacturing facilities make some of its mobile phones. The company didn't announce changes in that area.

For now, Microsoft makes nearly all smartphones on the market that run the mobile version of its Windows software. Mr. Nadella said in a statement that the company would seek to encourage more independent phone makers to sell phones that run Windows, just as Microsoft does with PC companies.

It isn't clear independent companies will be interested in pushing Windows smartphones that have so little sales potential. Even before the Nokia acquisition, that company was responsible for an overwhelming majority of smartphones with the Windows operating system.

In the accounting write-down disclosed on Wednesday, the company said it would record an impairment charge of roughly $7.6 billion tied to the Nokia deal, wiping out the majority of the $9.4 billion in value Microsoft had recorded for the business. The company also said it would take a restructuring charge of between $750 million and $850 million for eliminating up to 7,800 jobs out of a current workforce of 118,000.

Last July, Mr. Nadella said the company would cut up to 18,000 positions in the largest workforce reductions in Microsoft's history. Most of those cuts were to reflect overlapping positions from the Nokia deal.

Write to Shira Ovide at shira.ovide@wsj.com

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