Mainelli said it was impossible to know whether the consumers who claimed to have been Insiders had actually been participants, or simply thought they were because they had downloaded the upgrade soon after its launch.
In early July, about four weeks before Windows 10 debuted, Microsoft claimed that there were 5 million registered users in the Insider program.
Only about 5% of those surveyed said they had bought a retail copy of Windows 10 and used that to do a "clean" install -- wiping the system's hard drive, then installing the OS -- while the same percentage said they'd gotten Windows 10 on a new PC they had bought or been given.
The latter figure, as well as other results from the poll, confirmed the suspicions of most analysts, including IDC's, that Windows 10 wouldn't spur new PC sales. Fewer than 3% of the respondents told the pollster that their upbeat opinion of Windows 10 meant they had accelerated their timetable to buy a new system. Meanwhile, more than half said that Windows 10 had had no impact on their purchase plans, and that they weren't planning on buying a new PC.
"The poll shows that people using Windows 10 like it, which is a positive," Mainelli said. "And this survey shows that while many consumers have embraced Windows 10, they're not necessarily buying new systems to get it."
IDC's end-of-year PC shipment report, released Tuesday, estimated that the global industry contracted another 10% in 2015, although the decline was substantially less -- about 3% -- in the U.S. for the year.
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