When it comes to EPUB, I will very much recommend Mohoo Reader, followed by Bookviser. Try both, you wont be disappointed. While Freda has a lot many options, It's interface feels so amateur and ugly (compare screenshots of Mohoo vs. Bookviser vs. Freda, you will see what I mean).
Thanks for all the suggestions. I've tried OneDrive, Mohoo, Freda and Bookviser just as you guys have advised.
I've settled on Bookviser. It is very simple and sleek in design. I like it. I've also started using Bookviser on my Win 8 laptop. But it has problem syncing. The first time after enabling syncing went fine. After that, the sync log says Connection error or API error. I can browse different online catalogs in Bookviser. So I don't think there is a internet connection problem.