How do I use some of the advanced features of the conversion tools? The EPUB I produced with calibre is not valid? How do I convert a collection of HTML files in a specific order? What’s the deal with Table of Contents in MOBI files? How do I convert my file containing non-English characters, or smart quotes? I converted a PDF file, but the result has various problems? What are the best source formats to convert?
What formats does calibre support conversion to/from?