ReadWriteWeb writes "Read/WriteWeb offers 3 scenarios for a GoogleOS and suggests it could be less than 6 months away. They say it may be a web based desktop (aka WebOS), a full featured Linux distribution, or a lightweight Linux distro and/or BIOS. They predict that once Microsoft's Vista rolls out, it will present a direct threat to Google's Web properties and so therefore Google will start a more punchy strategy — pushing Firefox and some form of Google OS in order to nullify Vista's potential impact."
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