You can move your mobipocket book to Calibre. Once you have downloaded the library ebook into Mobipocket Reader, you will find the file in the path my documents/my publications. Loading the book into Calibre will not solve the issue of DRM, however. As Wallcraft mentions above, there are tools that will do this. Only when the book iis DRM free can it be read on your jetbook.
You will have this same issue with Epub & PDF format library ebooks unless your Jetbook supports Adobe DRM'd encryption.
cheers
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