http://www.askvg.com/how-to-change-or-reset-product-key-of-microsoft-office-xp-2003-and-2007/
Extend Your Office 2013/365 Trial to 180 Days
http://www.howtogeek.com/148347/how-to-extend-your-office-2013365-trial-to-180-days/
FreeOffice for Windows and Linux, SoftMaker Office Mobile for Android
origin - http://www.pipiscrew.com/?p=2771 change-or-reset-product-key-of-microsoft-office