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Microsoft's Windows OS last month took its biggest market share dive in the last two years, an Internet measurement company reported Monday, erasing gains made in two of the last three months and sending the operating system's share under 90% for the first time.

Microsoft is warning users of a rise in attacks on a vulnerability in Windows that could trigger a worm infestation on networks, and the company is encouraging companies to apply an emergency patch released in October.

The Red Hat-sponsored Fedora Project on Tuesday released Fedora 10, the latest version of the free Linux-based operating system, with a wide range of improvements in areas such as virtualization management, networking, boot time and security.

A federal judge in Seattle has ordered Microsoft CEO Steve Ballmer to testify in a class action lawsuit against Microsoft that alleges the company misled consumers in a marketing campaign for its Windows Vista operating system in which computers sold with an older Microsoft OS were labeled 'Vista Capable' when in fact they could only run a basic version of Vista.

The US Department of Defense computers have been hit with an old worm that the DoD won't discuss other than to say it is taking steps to mitigate its effects.

An Austrian security vendor has found a vulnerability in Windows Vista that it says could possibly allow an attacker to run unauthorized code on a PC.

Lawyers for the plaintiffs in the Vista Capable class-action lawsuit want to grill Microsoft CEO Steve Ballmer for three hours to find out what he said to top executives at Intel, Hewlett-Packard and Best Buy when they complained about the marketing program and its after effects, court documents unsealed Wednesday show.

IBM plans to acquire virtualization vendor Transitive Corporation, whose software lets applications run on multiple platforms even if they were designed for a single type of microprocessor and operating system.

Numerous Microsoft employees, including some top executives, urged their company to hold the line on the graphics requirements for the "Vista Capable" marketing campaign, both before and after the decision was made to loosen the rules, according to insider e-mails recently unsealed by a federal judge.

A Hewlett-Packard (HP) executive was furious at Microsoft over the company's decision to loosen the requirements for its "Vista Capable" marketing campaign, internal e-mails unsealed by a federal judge on Friday show.

Pressured by Intel, Microsoft relaxed the rules for a crucial Windows Vista marketing program -- a move that let the chip maker sell older graphics chip sets that were incapable of meeting the original requirements, internal e-mails show.