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I've got two computers running windows vista. If I buy Windows 7 Professional Upgrade, can I upgrade both computers? Or will I need two copies of Windows 7 Professional Upgrade?

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up vote 4 down vote accepted

Yepp you will need two. (You can get a "pack" of upgrades I guess, check the web for more information on this. Like the "family pack" from Windows7.)

(One key, one PC is the key word. Except if that is a MSDN key.)

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You will need a different license for each computer; once a license key is activated, it would not work for the 2nd machine.

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One copy of the upgrade will work, but you will not be acting in accordance with the licence agreement between you and Microsoft.

It would be like you and your twin sharing a driving licence - you will look similar enough to get away with it, but it is still wrong.

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Hmm the latest WPA update won't kill this method? (I heard about it but never tried) –  Shiki May 31 '10 at 14:03
    
@Shiki - Yup, believe Windows to go to reduced functionality mode. –  Sathya May 31 '10 at 14:20
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