I know i can't install in on the PRS-T1 as an app that i can open on the reader itself. But i thought it would be nice to have the library tool on the reader itself so every time i add a book to the reader it doesnt matter on what computer i am i can always update the metadata etc. But i found out the library keeps 2 files of the .epub the original and the edited. So that will provide a problem. It is possible to run Calibre from the PRS-T1 though