A security researcher said he has located a zero-day vulnerability in a printing feature on Internet Explorer that could allow remote attackers to execute malicious code.

Microsoft fixed six vulnerabilities, three of them rated critical, with four patches in its May Patch Tuesday round this week.

Microsoft has refuted the claim by PC Tools that Windows 2000 is less susceptible to malware than Vista.

A vendor of anti-spyware and anti-virus software has released a report saying that Windows Vista, the latest version of Microsoft's latest operating system, is more susceptible to malware than the company's Windows 2000.

Microsoft announced late Thursday that it plans to push out four patches, three to address critical vulnerabilities, in next week's monthly security update.

Microsoft has released what is believed to be the final update for Windows XP, the operating system prior to Vista, but still very much in use by enterprises and consumers.

The Storm Worm botnet is just a fraction of its original size, but malware remains on the rise, according to one email security firm.

Microsoft acknowledged it postponed the release of Windows XP Service Pack 3 because the upgrade can corrupt data in a point-of-sale software system.

On the eve of the scheduled release of Windows XP Service Pack 3, Microsoft has delayed the push-out because of a compatibility problem.

Microsoft has gone on the defensive in the massive SQL injection attack that has hit websites running the company's Internet Information Services web server and SQL Server products.