I have published an InfoQ news post about Microsoft's efforts to establish an ecosystem around its popular and now free digital note-taking app OneNote:
Microsoft recently announced the initial release of the OneNote API, which enables programmatic integration of its free-form information gathering and multi-user collaboration tool across different programming languages and platforms like Windows, Windows Phone, iOS, Mac OS, Android and the web.
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Continue reading the full post in Microsoft's New OneNote Service API Backs Free Apps for Windows, Mac OS, iOS and Android.