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Per Amazon email:

We wanted to let you know that starting August 2022, you’ll no longer be able to send MOBI (.mobi, .azw) files to your library. Any MOBI files already in your Kindle library will not be affected by this change.

MOBI is an older file format and won’t support the newest Kindle features for documents. Any existing MOBI files you want to read with our most up-to-date features for documents will need to be re-sent in a compatible file format.

Also, compatible formats now include EPUB (.epub), which you can send to your library using your Send to Kindle email address. We’ll also be adding EPUB support to the free Kindle app for iOS and Android devices and the Send to Kindle desktop app for PC and Mac.

If you have any questions, please visit our help page or contact our Customer Service team.

� More info @ Amazon ~

� AMZ Kindle Supported File Types:
Microsoft Word (.DOC, .DOCX)
HTML (.HTML, .HTM)
RTF (.RTF)
Text (.TXT)
JPEG (.JPEG, .JPG)
GIF (.GIF)
PNG (.PNG)
BMP (.BMP)
PDF (.PDF)
EPUB (.EPUB)
MOBI (.AZW, .MOBI) (no longer supports the newest Kindle features for documents)

Luckily, the only kindle document files I've got are PDFs.

But I know a lot of smaller publishing houses use Mobi so you can send your files to kindle.

Hopefully, anyone with Calibre should be able simply to convert their MOBI or AZW files to a format that is supported by Kindle.

Calibre is great and highly recommended, for sure!