How to change Product Key of MS Office 2010 ? How to activate Office 2010 with new Serial Key ? Changing Product key in Microsoft Office 2010 is very easy. If you installed your copy office 2010 with fake/Trial serial and you want to change the serial/Product Key, use the following steps. Step 1 : You need your MS Office 2010 installer you used before. Step 2 : Run the installer of MS Office 2010 Step 3 : Once the...