Originally Posted by ldolse
You can still use Calibre for converting to mobi though.
Actually, that's not a good idea these days as we don't know if the KF8/AZW3 output is ready for commercial use (from Calibre). As of now, it's best to use a well formatted ePub to run through Kindlegen to generate both the KF8 & Mobi. I know Calibre's Mobi output is good, but I cannot speak for the KF8/AZW3.