To clarify: MOBI support
starts winding down 1 November 2023 and will end completely on 20 December 2023. But it does not provide a time table for when each of the various STK clients will be decommissioned. (Web STK seems already not to accept MOBI formats.)
Quote:
Dear Kindle Customer,
Thank you for using the Send to Kindle service to send your documents to your Kindle. This is a final reminder that on November 1, 2023, we will start winding down support for sending MOBI (.mobi, .azw, .prc) files through Send to Kindle. This change will impact sending MOBI files through Send to Kindle for Email, Kindle apps on iOS and Android, and Send to Kindle apps for Windows and Mac. We will end all Send to Kindle support for MOBI files by December 20, 2023. MOBI documents already in your Kindle library and other document formats will not be affected by this change.
MOBI is an older file format and does not support the latest Kindle features for documents. If you wish to enjoy our most up-to-date document features, please re-send files in a compatible format. EPUB (.epub) is one such compatible format, and you can send it to your library from the Send to Kindle web app.
If you have any questions, please visit our help page or contact our Customer Service team. By downloading or using Send to Kindle, you agree to the terms here.
Regards,
The Kindle team
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This also dovetails with the recent expansion of KFX personal document support to recent Kindles and Kindle apps: finally these 'enjoy our most up-to-date document features'. Let's hope they eventually roll it out to all Kindles that support KFX (6th generation and later, i.e. PW2 and later).