By Tess Stynes and Robert McMillan 

For most of its 104-year history, International Business Machines Corp.'s lifeblood has been business hardware: cheese slicers and card punches in the early days, mainframe computers and microchips of late. As hardware sales have shrunk, though, the company has bet its future on software and services--a strategy that has yet to bear fruit.

Hardware sales continued their slide in the first quarter. IBM reported Monday that sales at its hardware group totaled $1.7 billion for the first quarter of 2015--down from $2.4 billion during the same period last year. Much of the drop resulted from IBM's sale last year of its commodity server business.

Revenue dropped to $19.59 billion from $22.24 billion as a surging U.S. dollar compounded the impact of shrinking hardware sales. It was the company's 12th straight quarter of year-on-year declines. Revenue was flat from a year earlier excluding currency changes and divested businesses.

IBM plans to spend $4 billion this year on software and services delivered in the cloud. Last year these nascent businesses accounted for $25 billion, or 27% of annual revenue. IBM hopes they will grow to $40 billion, or 40% of revenue by 2018.

Martin Schroeter, the company's chief financial officer was optimistic during a conference call, saying the company's "strategic imperatives" grew by more than 30% during the quarter. "I'd say we had a pretty strong start to the year," he said on a conference call with reporters Monday. Investors agreed, buoying the stock price 3.4% in after-hours trading.

Meantime, IBM expects its hardware business to improve this year as it refreshes its mainframe and Unix computer systems, but IBM is facing a new generation of cloud-computing competitors. Analysts expect it to continue to struggle this year in services and software, UBS analyst Steven Milunovich said.

"Investors and users both see them on the wrong side of the fence when it comes to disruption," Mr. Milunovich said.

Big Blue also has been pushing sales of its Watson software. IBM's Watson data-mining technology has delivered high-profile results, famously winning at "Jeopardy!" in 2011, but the path to revenue has been slow.

IBM has unveiled several Watson-based efforts in recent months, most recently a partnership with Apple Inc., Johnson & Johnson and Medtronic Inc., to gather and analyze a flood of health-related personal information. Known as Watson Health, the alliance transfers IBM's experience in data processing to the health-care field, part of an evolving strategy to pool and analyze data from other companies, such as Twitter Inc. and the Weather Channel.

Overall, IBM reported a profit of $2.33 billion, down from $2.38 billion a year earlier. On a per-share basis, earnings rose to $2.35 from $2.29 on fewer shares outstanding. Excluding restructuring-related charges, retirement-related charges and other items, per-share earnings from continuing operations rose to $2.91 from $2.68.

Analysts polled by Thomson Reuters expected per-share profit of $2.80 and revenue of $19.64 billion.

Global technology segment revenue declined 11% to $7.9 billion, but excluding divestitures and currency fell 1%.

Software segment revenue dropped 8% to $5.2 billion, but excluding currency fluctuations declined 2%.

Global business services revenue decreased 13% to $4.3 billion, but excluding divestitures and currency impacts fell 4%.

As of February, IBM expected currency to hurt revenue growth by more than 7 percentage points, compared to the hit of 6 to 7 percentage points it projected in January. For the full year, IBM is expecting a foreign-exchange impact of more than 6 points, more than previous projections for an impact of 5 to 6 points.

Write to Tess Stynes at tess.stynes@wsj.com and Robert McMillan at robert.mcmillan@wsj.com

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