We can install Office 2010 for free to trial using in some days, After the free period passed, how are you going to do? If we buy product key, how can we apply the product key without re-install Office 2010 ?
Office 2010 does not provide a direct user interface to let user input product key. They just provides a activate UI such as phone call service in Word 2010 Help menu.
We should go to Control panel to find the solution.
Go to Control Panel in Windows 7, try to uninstall Office 2010, but we are not going to uninstall actually, we right click “Microsoft Office Professional 2010” and choose “Change” option:
Then you can see the following window, there is an option: Enter a Product Key.
Now input your Office 2010 product key, if your product key is valid, System will continue to install something which is like the following screen.
After installation finished, your product key updated done also.