The question is... does your client mean old style mobi as mobipocket files or kindle azw's? As I understand the description on the programs' file formats page they clearly support only the old ones. Neither combo, nor purely new generation Kindle files.
Quote:
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Originally Posted by www.ultraebookreader.com/formats/
eBook saved in the MOBI format, a format originally used by the Mobipocket Reader but now supported by several different readers; may incorporate DRM copyright protection to prevent copying
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