I am using original Windows 8 on my Desktop and laptop. Office 2013 is also installed on both activated using Phone method. I upgraded Windows 8 on desktop to 8.1 was able to retain office 2013 activation. Whereas on my laptop when I upgraded to Windows 8.1 its asking me to activate office 2013. Using system image have switched back to Windows 8 with office 2013 fully activated. Please guide a method by which I can back up / carry forward my office 2013 activation from 8 to 8.1.