OneNote is a note-taking and organizational app that is available across all major platforms and as a web app. It allows users to store notes, photos, videos and other documents in the cloud for access anywhere. The OneNote API allows developers to build apps that integrate with OneNote by saving content to notebooks and querying user notes programmatically. Future apps will be able to leverage implicit capture of user data from various sources and use OneNote's search and storage to provide more personalized experiences by understanding user interests and preferences.