May I use the same licence for Windows on different partitions? [duplicate]

Who knows. The EULA which will determine this has not yet officially been published by Microsoft.

Can I activate the same license on both installations?

Looking at the EULA for Vista, yes and no.

Technically, yes. Because the activation wizard will see that you are installing onto the same machine it should activate without question.

Legally, no. You are only permitted to have one single copy installed at any given time.

Really interesting article here for bedtime reading although it does only apply to Vista. Again, no official word on the 7 EULA yet.

How does retail licensing work in such situations?

Retail boxes will come with a single key that activates both the 32-bit and the 64-bit flavours. You simply select the 32-bit or 64-bit version during the installation process.

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