@mol39, Way back when when the Kindle first came out, the firmware was a lot more open and Calibre could manage collections on the Kindle. But because too many people were mucking about and doing stupid stuff and then calling Amazon for help, Amazon made the firmware less open. The current firmware is so closed that it cannot be jailbroken.
If you want Calibre to manage collections, you'll need to get a different brand Reader.
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