Three Steps to Activate Office Professional Plus 2010 for free: - Open MS office word. At that point open File Tab... Snap on HELP tab. Subsequent to opening HELP tab, click on CHANGE PROUDUCT KEY. Enter the Product/Serial Key:26MXR-K94QG-GKKBW-QJC6T-4XWY3. At the point when you have restarted your PC, open MS office word, another window opened to actuate your MS Office Professional Plus 2010.