Because I would need to be able to search given words in ALL the ebooks I just purchased. As far as I can see, in Adobe Digital Editions or Calibre I can search words within the document which is open, but not in the other files which are in the same directory.
In Adobe Acrobat, you can search and find items in the document which is open, but also in all the pdf files of a given directory -but Acrobat does not support epub files. I would be happy if Calibre or ADE allowed me to do the same, but I don't think that feature is implemented right now. So the only solution I can think of is converting the epub files to PDF.
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