It is, and is integrated well with the Surface and the Surface pen. Works great for taking handwritten (or typed) notes and having it sync to my phone/desktop i

It is, and is integrated well with the Surface and the Surface pen. Works great for taking handwritten (or typed) notes and having it sync to my phone/desktop immediately. I use it often to take notes at meetings then I am able to send all the notes/diagrams to others in pdf form when I get back to my workstation. Big fan of OneNote.