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if you have a lot of MOBI ebooks, one approach would be to keep the Cybook and the MOBIs, strip the DRM from Adobe ePub and format shift from ePub to MOBI using Calibre. Doing this looses some formatting, but Calibre's ePub to MOBI is very good at keeping as much ePub flavor as possible in MOBI format.
If you want to switch to ePub as your primary format, then, as HansTWN says, only DRM-free MOBI will be allowed on the device and mass conversion by Calibre to ePub may be a viable alternative. In any case, the PocketBooks and the Hanlins (BeBook, EZ Reader, ...) support DRMed ePub and DRM-free MOBI.
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