The pricing structure of M$ OS hasn't been very logical since Vista. With XP it cost under half the full price for a copy of XP pro upgrade. But with Vista this wasn'y true, costing only about 20% less that the retail version. And with Windows 7 it is even worse.
Doesn't really inspire users to upgrade.
As I said about though. Upgrade copies are still the full version just like the full retail versions. They just ask for some proof of purchase of a previous version before allowing it to install. You can use an upgrade copy to install to a new/blank HD, just as with the full version. You don't need a previous version installed on the hdd.





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