a friend has comed to me with a windows 7 setup dvd.

he told me that it is free to use until march 2010. is this right? what it will happen after that date?

If i install now windows 7 in march i have to go back to vista if i don't wana buy the win7 version or what?

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You should probably accept MrStatic's answer, which is near identical, and posted 1 hour earlier. – RJFalconer Dec 31 '09 at 15:15
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up vote 5 down vote accepted

He probably gave you a copy of the RC version of windows 7 this site will give you more info.

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You have most probably been given a RC version of Windows 7, which expires on March 2010. If by then you don't purchase and install the release version of Windows 7 then you will have to go back to Windows Vista.

winver

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