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Dual mobi is only for Smashwords or your own use.
The mobi format has been depreciated for UPLOADS years ago. The epub2 is recommended.
This has only ONE effect on Amazon customers. Newer Kindles may get more advanced formatting than possible from mobi uploads to KDP. Older Kindles will still get mobi/KF7 downloads.
AFAIK Amazon doesn't deliver dual mobi to customers.
What Doitsu says.
So this is hardly news. Amazon no longer accepts an upload format that no-one should be using and they recommended alternatives years ago.
Oodles of free and paid tools convert wordprocessor content to epub2.
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