I have ID 5.5 (updated) and I have downloaded the Kindle plugin to export to Kindle. It used to work a few months ago but the option to export to kindle disappears and when I reload the plugin the option is still not there. I have reset the preferences and reinstalled but the option to export to kindle is still missing. Any help would be appreciated.
The Kindle plugin is created by Amazon, not by Adobe.
Have you asked in the Amazon Kindle Publishing forums?
Interesting, I didn't know they had a plugin.