ComputerWorld confirmed Dunn's account of OneCare's AU changes by installing the security suite on both Windows XP and Windows Vista.

At no time during installation, said Dunn, does OneCare tell the user that the software will modify Windows' settings or provide an opt-in dialog. Nor do the various online documents -- including Microsoft's privacy statement and an addendum for OneCare -- that are offered up early during the process contain any information about the changes. "It turns out there's a brief mention of it buried deep in one of the OneCare help files," said Dunn. "But that's not the same as telling users upfront."

The help file (select "What does Windows Live Update do to help manage and maintain my computer's software updates?" to view the pertinent section) acknowledges that OneCare makes changes without bothering to ask. "When you first install Windows Live OneCare, setup automatically enlists your computer in Microsoft Update and changes your computer's settings to download and install updates automatically using Automatic Updates," it reads.

Who's 'forgetful' now?
Although Microsoft was not immediately available for comment this morning, it made it clear last week that reports of unauthorized updates, and even PC reboots, could not be blamed on its software.

"I want to stress that the Windows Update client does not change AU settings without users' consent," said Nate Clinton, a program manager with the Microsoft Update team in a company blog entry a week ago. He went on to list five possible explanations; all require the user to take action or accept one option from several offered.

Earlier, a Microsoft spokeswoman had been more blunt. "It may be more a case of someone clicking to change their AU settings but not realizing/remembering doing so," she said last Tuesday. She also called out OneCare's installation as one such possible moment and claimed that the security suite offered users the option of changing AU settings. It does not.

"This is just one more example of Microsoft having the attitude that we know better than you do, that you should just stop asking questions and let us do what we want," said Dunn.

Computerworld is an InfoWorld affiliate