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Microsoft's Vista: Last big PC release?

The update to its ubiquitous Windows operating system could be the end of an era, some experts say.

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In the years ahead, nearly all PCs will migrate to Vista as Microsoft drops its support for earlier Windows operating systems, says Ben Gray, a Forrester analyst.

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Early sales are expected to come mostly from consumers. Businesses are notoriously slow to adopt a new OS. A Forrester survey of more than 450 North American enterprises earlier this year found 11 percent said they would switch to Vista within six months of its release and 29 percent within a year. But 60 percent said they either would wait longer than that or had no plans to switch at all.

Because businesses must test how their own applications work on Vista, it could take them six to 18 months to get ready to deploy, Mr. Gray says.

PC owners will be able to buy a copy of Vista to install on their current computer. But the computer will have to be "Vista ready" – most likely a fairly new machine with plenty of memory and other robust technical specifications. To add to the confusion, four versions will be available – Home Basic, Home Premium, Business, and Ultimate – each with its own set of features and requirements. Microsoft's Vista website offers advice ( /getready) that can help determine which version, if any, an existing computer will be able to run.

Anyone installing Vista will have to be computer savvy. "I wouldn't advise a Vista install," Duboise says, calling the process something "not for the faint of tech heart." But Gartenberg is less daunted. "We're dealing with a pretty sophisticated digital consumer these days," he says, "and I don't expect it's going to be a huge issue."

A survey of computer sales last month by Current Analysis found that about one-third of the laptops and about 60 percent of the desktops sold would be able to run Vista Premium.

Half of the PCs in use by businesses today can't run any version of Vista, and 94 percent can't run Vista Premium, says a report from Softchoice Corp. Though Vista Basic should operate with 512 megabytes of system memory, for example, 1 or 2 gigabytes is recommended for Vista Premium, the version that displays the most innovative aspects of the new operating system.

"If you want to experience what Vista is all about, you want to go to the Premium," Duboise says.

Earlier this month, Gartner Inc. predicted that Vista would be the last big release of a new Windows operating system by Microsoft. "The next generation of operating environments will be more modular and will be updated incrementally," the research firm said in a forecast for 2007. "The era of monolithic deployments of software releases is nearing an end. Microsoft will be a visible player in this movement, and the result will be more flexible updates to Windows and a new focus on quality overall."

But both Duboise and Gartenberg see major Windows releases still ahead. The era of "software as a service," not on your PC, is not here yet.

"People have been saying for 10 years that the operating system is irrelevant, and everything is coming through the Internet," Gartenberg says. "Yet more and more is still being done through the operating system."