Actually, I have Office 2010 running on my main machine (Win 7). I was planning on doing a complete reformat and reinstall of Win 8.1 and then switching to Office 365. I already have Office 365 installed on a Surface Pro. Now I am beginning to think I should activate Office 365 on my main machine before I reformat and install Win 8.1. Would that capture my main machine's Word and Outlook settings to the cloud? Should I uninstall Office 365 from my Surface Pro first?