By Steven Norton and Clint Boulton 

Recognizing growing competition from cloud-based companies like Salesforce.com, large, established software vendors including Oracle Corp. and SAP AG are rewriting their applications so customers can run them online rather than in their own costly data centers.

But many of those software vendors' biggest customers are in no rush to make the switch, particularly when it comes to the applications that manage key parts of their businesses.

There is no doubt that cloud software is gaining ground among corporate users of all sizes. Revenue for Oracle's cloud businesses in the quarter ended May 31 totaled $450 million, up about 22% from a year earlier, although it remains a relatively small portion of the company's overall revenue.

While many larger companies have turned to cloud software to manage systems like human-resources management, they are slower to adopt the cloud for applications that handle inventory management, billing and other processes they rely on to run their businesses on a daily basis.

For companies using this type of software to do things like manage the filling, sealing, shipping and billing for thousands of shampoo bottles every hour, there is still too much risk associated with potentially unreliable Internet connections and a dependence on third parties to manage computer servers. The chief information officer of a global consumer packaged-goods company said, "if our [enterprise resource planning system] goes down for five days, we're out of business."

Most ERP systems still run in corporate data centers, and have been customized at great expense to fit each company's specific needs. Roman Coba, CIO of McCain Foods Ltd., which uses SAP's ERP software, said moving such an ERP system to the cloud would be akin to a "heart transplant."

But corporate customers recognize that cloud-based systems can offer greater efficiency and flexibility, and they are switching to the cloud where practical. For example, Xerox Corp. uses on-premise applications from both SAP and Oracle to manage critical business needs such as billing, and uses cloud software from Oracle and Salesforce.com to manage sales accounts and human resources. But CIO Stephen Little said thinking about the complexity of moving the ERP systems to the cloud "makes my head hurt."

SAP says it has hundreds of customers using its cloud ERP software, and says it wants to accommodate customers at whatever rate they choose to move. "If customers are happy to continue to invest on premise, SAP will continue to support them," said Irfan Khan, senior vice president of SAP's database and technology unit. "There's not a compelling event that states by a said date everybody must switch from one environment across to another."

"A lot of our effort has been helping customers pick up new product offerings and modules in the cloud while enabling them to coexist with what a company already has," said Thomas Kurian, senior vice president of product development at Oracle.

Cloud adoption from large enterprises often comes at the divisional level and through add-on modules. While Oracle offers services to help facilitate the switch to cloud, many core enterprise ERP platforms remain on-premise.

A recent survey by UBS AG of 101 CIOs in the U.S. and Europe found that more than half would move some workloads to a public cloud, but it would be a gradual process, while a third of respondents said they were moving to a public cloud as quickly as possible.

Barry Brunetto, vice president of information systems at Blount International Inc., says he has moved some SAP applications to the cloud that help manage secondary business functions such as credit-card processing, and plans to move his data warehouse there as a test. If the transition is successful, the firm will consider doing more. If it fails or costs more, "we would just use our on-premise one and it's no impact to the business."

Larger customers are also unlikely to switch from, say, Oracle's on-premise applications to cloud applications sold by a startup. Brian Lillie, CIO of Equinix Inc., said the cloud billing and order-management software he has evaluated from startups lack the features and functionality of more-polished Oracle apps. As a result, he said companies have few incentives for people to change core legacy systems--for the time being.

But Sandra Kurtzig, CEO of cloud ERP startup Kenandy Inc., said while Oracle probably has more features, large businesses choosing Kenandy are satisfied with its functionality. She said they prefer software that runs on the cloud because they are tired of upgrading and custom-programming software.

The shift to cloud for the major tech vendors will likely hit top-line revenue in the short term. Instead of purchasing software and services upfront and paying monthly maintenance fees, cloud services are delivered through a subscription model that spreads revenue out over time.

One area Mr. Lillie says he is open to switching is in traditional office functions like email, and document writing and sharing. Equinix recently decided to use Microsoft Corp.'s Office 365 service, which will help reduce the cost of storing email and other data.

Unlike ERP, there is little to lose by migrating email and office productivity software to a cloud provider. "You show me the most well-run email systems in the world and I'll show you no competitive advantage that results from it," said Chris Laping, CIO of casual-dining chain Red Robin Gourmet Burgers Inc.

John Case, corporate vice president of Microsoft Office, said Office 365 could eventually provide customers an on-ramp to the company's other cloud software. Getting customers on Office 365 "will make other Microsoft cloud products look more attractive," said Mr. Case.

Industry analysts say the pace of adoption of cloud computing is dictated to a large extent by industry segment. Research firm Gartner Inc. says at least 30% of service-centric companies will move most of their ERP applications to the cloud by 2018. Many companies will likely embrace the "hybrid" model, using both cloud and on-premise functions.

Kenandy's Ms. Kurtzig says large customers look to cloud ERP software when they need to get an acquisition up and running quickly, or are looking to expand into new markets. But ultimately, she says this shift to the cloud is more about modernizing technology.

"People are talking to us because we have the [cloud] system that's built for the future, not for the past."

Write to Steven Norton at Steven.Norton@wsj.com and Clint Boulton at Clint.Boulton@dowjones.com

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