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As was said by shadowmane, this isn't helpful unless you're already running an operating system which supports IE6. I like to try and maintain a healthy, unbiased attitude toward operating systems. I currently run Ubuntu because I feel that it is currently the best option for me personally. I would be more than happy to switch to Windows Vista if I felt that it would provide a better alternative. This "test drive," however, presupposes that I am already running a Microsoft operating system (or possibly IE6 on a mac?), so I'm not really sure how this is meant to help people who are considering switching to Vista. I mean, let's face it, if you already are running Windows you're going to upgrade sooner or later. There aren't too many people still running Windows 98 anymore (NT is another story..), so I'm not sure what the legitimate purpose of this could be.
It is all part of the "denial of alternatives" attitude that Microsoft has had for years.
They do not want the general public to think of Linux/BSD/Solaris as an alternative to Windows, so, they deny their existence.
By making sure the demo can only be viewed by Windows users, it maintains the idea in Joe Publics head that the computer IS Windows......
Also, Microsoft need to target XP users, as that is where the majority of uptake of Vista will come from.
Can you honestly show me 1 Linux user that is even tempted to switch to Vista ?