Quote:
Originally Posted by DrNefario
...which usually means it ought to be mobi compatible...
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Incorrect.
Mobipocket files for the old PalmOS were in the compiled Palm Resource (PRC) format. The PDB format was used by a variety of other ebook formats. The most common, and the only two supported by calibre, were the AportisDOC (aka PalmDOC) and Peanut Reader (later known as Palm Reader) formats. If, and only if, they are AportisDOC/PalmDOC files then Mobipocket Reader will read them. That doesn't make them MOBI format, though.
@Quelch: The issue with the boxes is generally caused by using the incorrect encoding choice during conversion. Calibre can't detect the encoding automatically in these files (I don't believe it is spec'd in the file). Try converting again selecting various different code pages in the Input Character Encoding field on the Look & Feel tab. Start with cp1252, which is the most likely.