I've recently change from the Kindle4 to a Kindle Touch and found I can no longer use the "kindle collections" in Calibre to manage my collections.
I was gutted, but following the suggestion at the beginning of the forum, I sent an e-mail to Amazon, imploring them to enable this ability on the Kindle touch..........
Well from the response I got back, I wonder if the support staff have ever used a Kindle or if they are even aware that you can buy content from any other source other than Amazon........... they were absolutely useless and not interested.