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					Originally Posted by Graham44  I might be misunderstanding, but you downloaded your kindle books to Calibre but when you want to read them you redownload them straight to your kindle via wifi? | 
	
 Probably as back-up.  Amazon have form in deleting purchased content.
In my case, I use Calibre to consolidate my library as I obtain books from a variety of sources, and then sideload everything to my Kobo (even Kobo purchases).  That allows me to clean up the metadata, especially series info.  I also back-up my Calibre content to the cloud.