The advantage of reading on a mobile device is that you can read your ebook absolutely anywhere, you aren't only confined to a desk. Also most people already own a mobile phone or tablet so they do not need to spend extra purchasing a dedicated ebook reader device. The disadvantage is that the screen is smaller and it can be harder to read when compared to a nice big computer monitor.
Unfortunately Windows Phone devices are not compatible. There is a very old version of the Ebook Reader app available in the Windows Phone Marketplace, but we have stopped development on it and can no longer provide support for it.