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Computerworld - The Internet advocate who blasted Microsoft in 2006 over the daily "phone home" habits of its anti-piracy software took the company to task again today for a new practice that will examine consumers' Windows 7 PCs every 90 days to make sure they're running legitimate copies of the OS.

Lauren Weinstein, the co-founder of People For Internet Responsibility (PFIR), urged Windows 7 users not to accept the option update to Windows Activation Technologies (WAT) when Microsoft begins seeding it to the Windows Update service later this month.

"The approach that Microsoft is now taking doesn't seem to make sense, even for honest consumers," Weinstein argued in a post to his blog. "Microsoft will trigger forced downgrading to non-genuine status if they believe a Windows 7 system is potentially pirated based on their 'phone home' checks that will occur at (for now) 90 day intervals during the entire life of Windows 7 on a given PC, even months or years after purchase.

On Thursday, Microsoft announced the WAT update would identify pirated copies of Windows 7 that had been illegally activated using any of more than 70 "cracks," or activation exploits. After users install the update, the WAT software will regularly connect with Microsoft's servers -- the "phone home" functionality that Weinstein called out -- to download new crack "signatures," which would then be used to reevaluate the copy of Windows 7.

The repeated validation is new to Windows, confirmed Joe Williams, the general manager of Microsoft's Genuine Windows group, who said that neither Windows XP or Vista had reevaluated already-activated Windows PCs on a regular schedule. Machines that had had significant hardware component replacements were the exception: Swapping out a motherboard, for instance, would typically trigger another activation validation.

Williams defended the change. "We want to make sure we're protecting our customers," he said, against newly-developed activation cracks that may have slipped by Microsoft, or simply not been in use, when the PC was originally activated. "And we're a commercial enterprise, and it is important that our [intellectual property] is protected."

Weinstein countered that Microsoft was overstepping its bounds by demanding validations in perpetuity. "Say you've used your system for a year. Is it reasonable for Microsoft to say, 'We changed our mind and now you're not genuine'?" asked Weinstein in an interview today. "It's one thing to validate when you originally get the system, but to do that months or years later, and [for] Microsoft [to] say, 'Now we're going to say your Windows is not genuine,' ...it becomes a matter of ownership. At what point is one free of this constant checking?"