Uh, why should I output from OpenOffice in anything other than ODT, since Calibre reads those files directly? (Something I didn't know but found out yesterday).
I originally had tried that extension (it didn't work for me but that's another story) and then someone on the Open Office forum pointed out that Calibre took the native files, which is what I've now been doing with success. However, if there are advantages in outputting from OO in an ePub format I'd love to hear it.
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