Question about upgrading

#1
Hi I have Vista Home premium.
As everyone know; there are 3 window 7 editions which are:

- Home premium
- Professional
- Ultimate

So here is my question.. I have Vista home premium so does my computer can be only upgrade to Window 7 home premium?

Or my computer just simply able to upgrade to all available editions despite of what edition i have currently?
 


#2
There are 6 editions technically but anyway.. you can only upgrade like for like -

Home Premium > Home Premium
Business > Professional
Ultimate > Ultimate

Hope this helps :)
 


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