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windows 7 home BASIC to windows 7 professional upgrade
I would like to upgrade one of our computer in the office which come with windows 7 home BASIC (not PREMIUM) to windows 7 professional.
but i can't find the upgrade purchase option of this. I am finding the upgrade of home premium to professional but not of home Basic to professional
can anyone here guide me to the right direction.
we are looking for upgrade version instead of full version to save the cost.