(Bloomberg) -- International Business Machines Corp. reported quarterly revenue that missed analysts’ estimates, signaling Chief Executive Officer Arvind Krishna’s plans to shed legacy businesses and focus on cloud services will take more time to bear fruit.Sales fell 6.5% to $20.4 billion in the three months ended Dec. 31, the Armonk, New York-based company said Thursday in a statement. That was below the $20.75 billion analysts had forecast, on average, and marked the 10th consecutive quarter with no year-over-year increase in revenue. The shares fell in extended trading.Last October, Krishna announced he would spin off IBM’s managed infrastructure services unit into a separate publicly traded company. The division, which is currently part of IBM’s Global Technology Services division, handles day-to-day infrastructure service operations, like managing client data centers and traditional information-technology support for installing, repairing and operating equipment. While the unit accounts for about a quarter of IBM’s sales and staff, it has seen business shrink as customers embraced the shift to the cloud, and many clients delayed infrastructure upgrades during the pandemic. The spinoff is scheduled to be completed by end of 2021.Revenue declined across IBM’s business segments in the fourth quarter. Cloud and Cognitive Software, IBM’s biggest unit, saw revenue decrease 4.5% from a year earlier. That follows a 7% gain in that unit in the third quarter. Total cloud revenue increased 10% to $7.5 billion. In Global Technology Services, revenue fell 5.5% while sales from Global Business Services dropped 2.6%. Systems, which includes hardware and operating systems software, saw sales decline 18%.Krishna said the company’s actions to focus on cloud and artificial intelligence “will take hold,” and give him “confidence we can achieve revenue growth in 2021.” The company hasn’t given specific financial forecasts since it withdrew its annual projection for 2020 in April.IBM fell about 6% in extended trading after closing at $131.65 in New York. The stock has declined about 5% over the past 12 months.“It’s more or less a reflection of the difficult spot they’re in,” in trying to restructure the business, said Daniel Elman, an analyst at Nucleus Research.IBM seeks to distinguish itself from its bigger rivals in cloud, such as Amazon.com Inc. and Microsoft Corp., by offering a hybrid model, which assists clients in storing and computing data across on-premises infrastructure, private cloud services and servers run by public providers. Krishna was the driving force behind IBM’s $34 billion purchase of open source software provider Red Hat in 2018, the first step toward transitioning IBM into what it sees as a $1 trillion hybrid-cloud market, and which now leads much of the company’s growth. Red Hat revenue increased 19% in the fourth quarter to $1.3 billion.IBM continues to make acquisitions to bolster its cloud credentials. The company has made seven acquisitions focused on cloud and AI since October, Chief Financial Officer James Kavanaugh said in the statement, including Taos Mountain LLC, a firm that helps companies shift software and data online, and Instana, which manages cloud applications.Fourth-quarter earnings excluding some costs were $2.07 a share, beating the average analyst estimate of $1.79. Gross margin was 52.5%, 1.3 percentage points higher than analysts’ expected.(Updates with analyst comment in seventh paragraph. A previous version of this story corrected the spelling of the CEO’s name in first paragraph.)For more articles like this, please visit us at bloomberg.comSubscribe now to stay ahead with the most trusted business news source.©2021 Bloomberg L.P.