I am an on-line publisher and downloaded calibre to help me convert to mobi pocket. I read the tutorial that came with the program but it talks about conversions to specific devices which you plug into the computer. I am hoping I don't have to make use of a device since I am converting multiple books in multiple formats to upload to different sites and don't own a Kindle. Am I going to be able to do that with the calibre or do I need to look for another program? (can you tell I'm new?)