If they are LRF files (meaning no DRM) you should be able to add them all to a Calibre library and convert them to Mobi format.
If they are LRX files (meaning they have DRM [were bought from Sony]) then you can't convert them as there's no way to remove DRM from LRX files at this time. However is they are LRX files it might/should be possible to re-download them from Sony in ePub format which can have the DRM removed. If that's the case and you choose to remove the DRM the ePubs will convert quite nicely to Mobi format.
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