Whatever you do, don't move to MS Office 2013, or at least don't delete your earlier office products if you do install 2013. The interface reminds me of the way Word and WordPerfect looked back in the days of dos. You get a choice of three colors - white, light gray, medium gray. It hurts the eyes and is difficult to discern things. I gave up on it after 2 days.
Going from the colorful desktop screen of Win 8 to an Office 2013 product is a real shock. A typical first look goes like this: "Look at at all those colors on the desktop! Start Word 2013, let's see what it looks like. Oh..uh....is your monitor broken?"