Quote:
Originally Posted by eschwartz
Yep -- those settings are confusing. OTOH, I am fairly positive the default is "old" -- so you would've had to deliberately set it. 
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default=old, had a vanilla V2.22 at hand.
But what's confusing about this, from tool tip and bottom panel ?
Quote:
By default calibre generates MOBI files that contain the old MOBI 6 format. This format is compatible with all devices. However, by changing this setting, you can tell calibre to generate MOBI files that contain both MOBI 6 and the new KF8 format, or only the new KF8 format. KF8 has more features than MOBI 6, but only works with newer Kindles.
My emphasis
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BR