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I have installed office 2010, using a key that I found on forums on the internet. It said it was used too many times already. But when I try to use the mak key that is on my account, it says that it is invalid. How do I change the key, if a key is still installed and is available for 30 days.

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up vote 2 down vote accepted

open one MS Apps like MS Word . Go to File >> Help >>

you will find out "Change Product Key".

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luckily I don't see the same thing because it still says that activation is required. And I can't activate it because the key is already used a hundred times. And the MAK key that microsoft itself gave me is invalid, – Ieyasu Sawada Mar 14 '10 at 11:28

You can change it as so:

  • Control Panel ⇨ All Control Panel Items ⇨ Programs and Features
  • Find Office 2010
  • Right-click it
  • Select Change
  • Select Enter a Product Key
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