I know it's not much advice but I've given up having one ebook system. At least for now. Simply because I haven't found a single source that provides all of the books I want to read. And converting them, especially DRM'd books takes a bit of effort.
Having said that try peeking over at the wiki for other Windows Mobile apps, some of which might be able to handle multiple formats. I personally have a couple of different apps on my phone (Android) to cover my entire library. It's been a long while since I used Windows Mobile so I'm not up to speed with what is available there.
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