Did you buy a copy of your Operating system?

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Mine was preinstalled with the laptop I bought a couple of months back. I have done so many downloads from microsoft.com. When I was browsing microsoft.com, I found this interesting offer by airtel india. They are providing free installation and deposit and also free internet for two months. I wanna know if anybody has tried this offer or not. Ofcourse, this is only for those who has a genuine copy of windows. Please let me know.