Though this is technically called, OneNote 2003 SP1, why I don’t know. It really is a whole new product with even more features - many excellent features which further improved this amazing product. If you are in a lot of meetings and need to track different things for different clients (which sometimes I have to at the same time), this is an invaluable product to use and worth every penny (IMHO). Chris Pratley, Program Manager for OneNote has more details in this post .