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Vista virtualisation rules relaxed

Vista virtualisation rules relaxed

Microsoft dropped its prohibition on running the most popular versions of Windows Vista in virtual machines because of a complaint filed with antitrust regulators, court documents show.

According to a status report filed with U.S. District Court Judge Colleen Kollar-Kotelly , Microsoft changed the end-user licensing agreements (EULA) of Vista Home Basic and Vista Home Premium under pressure from Phoenix Technologies Ltd. Phoenix, best known for the BIOS, or firmware, that it sells to PC makers, had filed a complaint with regulators sometime after early November 2007, arguing that Microsoft should open the less-expensive versions of Vista to virtualization.

"The complaint concerned a restriction in Microsoft's Vista EULA, which purported, for less expensive versions of Vista (Home Basic and Home Premium), to bar the user from running those versions of Windows on virtualization software," said the joint status report submitted to Kollar-Kotelly, the federal judge who oversees the settlement agreement struck between antitrust officials and Microsoft in 2002.

"Phoenix, which had recently announced a virtualization product, complained that Microsoft's EULA restrictions would deter OEMs from including its product on new PCs, and also deter consumers from using virtualization software made by Phoenix and other companies," the report continued.

Although the report didn't name the Phoenix's virtualization product, it was referring to HyperSpace, a technology the Milpitas, Calif. company unveiled in November 2007. HyperSpace embeds a Linux-based hypervisor in the computer's BIOS that allows the computer to run open-source software without booting Windows.

At the time, Phoenix touted HyperSpace as a platform for PC makers, who could use it to add instant-on applications such as security and maintenance tools, e-mail clients or even Web browsers to their wares. Users would be able to fire up those applications without taking the time, and on a laptop, the battery drain, required to boot Windows.

A little more than two months after Phoenix filed its complaint, Microsoft gave in. "After discussion with the Plaintiff States and the TC [Technical Committee, the three-person group that assists in monitoring Microsoft's compliance], Microsoft agreed to remove the EULA restrictions, and has done so," the status report said.

In fact, Microsoft announced the virtualization changes to Vista Home Basic and Vista Home Premium on Jan. 22, several weeks before the release of the report. At the time, company representatives were not made available to explain why Microsoft had added the two editions to the allowed virtualization list.

In a post to the Vista team blog that day, Shanen Boettcher, general manager of Windows product management, had mentioned the new rules only in passing, saying, "By modifying virtualization in Windows Vista Home Basic, we are extending virtualization rights to allow virtualization throughout all versions of Windows Vista."


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