My computer crashed on me and I had to get my hard drive replaced. I purchased a 3 product key office 2010 and have one more left but I don't want to use it. I read somewhere that apparently you can install office as many times as you want on the same PC with the one product key. My question is can I still do that even though I got a completely new hard drive?
Thanks

Reactivating Office on the same PC doesn't use up a licence unless there is a significant hardware change. If the new HDD is the same make & model as the old one, it shouldn't count as such a change. Even a different HDD make/model might not count. Regardless, the worst this will ever mean is that you might use up all your automatic activations, not any installation licences. If that happens, you'll need to use telephone activation, that's all.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]