International Business Machines Corp. reported a 12% decrease in revenue--the company's 12th straight quarter of year-over-year declines--hurt by the stronger U.S. dollar and weakness in its hardware business.

For the year, the company reiterated its estimate for per-share profit, excluding certain items, between $15.75 and $16.50.

Shares rose 0.4% to $166.87 in recent after-hours trading as the company's first-quarter per-share earnings exceeded expectations.

IBM is the middle of a corporation reinvention similar that is starting to feel a lot like its early 90s transition to a software and services company. The company is shedding unprofitable hardware businesses, as it pursues higher-margin fare in the realms of big data, security, cloud computing, and software and services for mobile devices.

Last year these initiatives accounted for $25 billion, or 27% of annual revenue. IBM hopes they will grow to $40 billion, or 40% of revenue by 2018.

The computing pioneer, originally known for big mainframe systems announced deals last year to sell its commodity server business--System X business--to Lenovo Group Ltd. and pay Globalfoundries Inc. to take over IBM's semiconductor manufacturing business.

The company 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, said UBS analyst Steven Milunovich in an interview last week.

"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, or $2.35 a share, up from $2.38 billion, or $2.29 a share, a year earlier. Excluding certain costs and discontinued operations, IBM's per-share earnings rose to $2.91 from $2.68.

Revenue decreased to $19.59 billion from $22.24 billion. Excluding currency impacts and divested businesses, revenue was flat from a year ago.

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

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