Joanna Rutkowska, a security researcher known for her work on virtualization security and low-level rootkits, has released a new open-source operating system meant to provide isolation of the OS’s components for better security.

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The news that Windows 7 — release candidate on track for April 30, thank you very much — will have available a virtualized version of XP that will run right right alongside 7 apps is exciting stuff for those of us who have shaken our heads at Microsoft’s backward-compatibility problems over the years. It means very nearly 100% compatibility with current Windows apps; it means side-by-side XP and 7 apps (dogs and cats living together!); it means that Vista was all just a bad dream. (Okay, maybe not.)

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